You won't believe what's causing this No start!

[@graycleary]

Fixed for free. What a true gentleman you are. Well done 👏🏻

[@ShitWrangler]

takin food of the plate of good families underselling the trade, undercut my own family DAMMIT

[@TheFrenchPug]

Dan is a great guy. You can tell he's just a genuinely good dude.

[@Diagnosedan]

When i called the owners they were so gratefull, that's worth more than money😁

[@bernardaflores1720]

@@Diagnosedan They do needed that car because of the Handy Cap ramp.

[@graycleary]

@@Diagnosedan Respect where it is due. Giving back is always a sure way to happiness.

[@johnbolongo9978]

This dude is amazingly good at what he does. A cut above. Nicely done.

[@gailtaylor1636]

He's the best.

[@Diagnosedan]

Thanks John that's appriciated

[@tonyrice3348]

Hes one of a handful on KZbin that are at the top of their game. Never ceases to amaze me how many times he diagnoses it correctly, oh that's 100% of the time, Dan is the man

[@uel202e0b]

His analytical skills are incredible.

[@PDR-wb9dq]

That truly was a great diagnoses Dan.... I am also a mechanic of over 35 years in the trade and I don't think I would have found that one, well done my friend that car means a great deal to the person that owns it as without out his car he would be a prisoner in his own home, that car might not be a lot to me and you but it means freedom to him and his family. Great to hear you gave your labour for free you are a good man..... well done my friend and best wishes from the UK 👍

[@Diagnosedan]

Thanks the owner was so gratefull that's worth more than money 😁

[@lylecoglianese1645]

@@Diagnosedan, what also makes it worth it is the great reviews he will share with family and friends! 🤗

[@waynesimpson2074]

@@Diagnosedan Fekn hell Dan, you are awesome, what a gent...subscribed, thanks.

[@ameribrahim5405]

Dan I'm a 20 year master technician and still learn something new with every video you put out. You are a diagnostic God. Thank you for sharing your knowledge

[@pauloconnor7951]

When I worked on Z's (Nissan Z's) in California; honestly we repaired these issues by plugging in new components; one after another. It worked; i've got to say.

[@carlt6932]

​@@pauloconnor7951Very hard to do that these days with the crap parts out there. I tell people if you do that keep your old parts.

[@Rhaman68]

By FAR, one of the best diagnose Dan videos! A true detective story full of compassion and technical expertise! Thanks Dan.

[@thejoneseys]

I did wonder if the pins were different but that really is unbelievable. I guess both of those Bosch sensors were from the same production batch. Without the old sensor that could have gone on a while longer 😁 Very frustrating and needless time and money wasted for everyone. Diagnosis for free guarantees a place in car heaven for you. Great work 👌🏻

[@Diagnosedan]

It already took me far to long😯

[@PhillipBailey]

@@Diagnosedan famous last words...this should be easy...

[@glasshalffull8625]

Years ago, another video mechanic said that it is always preferable to replace the crank position sensor with a replacement from the dealership. Seems he was correct.

[@slasher9883]

@@glasshalffull8625 Unless the dealership item was also made by Bosch (which is very likely in this case).

[@glasshalffull8625]

@@slasher9883 The dealership would immediately know something is wrong with the part as they replace more of those parts for their cars than anyone else. It’s a matter of volume and familiarity with their cars. I had a similar no-start issue and I had narrowed it down to crank position sensor and another sensor. The dealership parts guys helped me out by telling me for every one of the other sensors, they sell a hundred of the crank sensors. No guarantee, but they were right.

[@peterrichardson9355]

I watch a South Main Auto channel and he had the same problem with a Honda speed sensor cheap chinese made after abit of time decided to replace the part with a genuine part from the dealers bingo it worked so well done to you for taking the time to sort it for the customer and you will store that diagnosis for the next time shame on Bosch for not checking their products

[@Diagnosedan]

Yes it happens everywhere unfortunately

[@mjjohnson61]

@@Diagnosedan I diagnosed a Nissan Xxtrail with faulty cams sensor and lack power purchase a new one from dealer engine wouldn’t start installed old one engine started, new original sensor faulty ,

[@kennethtalbott2233]

yep, south main guy is well decent too. watch a lot of his stuff.

[@pa590skrt]

you got to love Dan for not charging for fixing this car. keep up the great work Dan! f

[@Diagnosedan]

Thank you 😁😁👍

[@MarcBeland]

I didn't get paid 😄 but I learned something (as I do with almost all your videos) so that to me is worth the time spent here. THANKS!!!!!

[@luigih5018]

I completely forgot my car issues watching this. Engagement to the next level❤.

[@ADVANCEDLEVELAUTO]

Great video Dan! I’ve been down several rabbit holes because of incorrectly manufactured parts. It’s part of what makes this industry so frustrating to work in, but I love what I do. Thanks again for the awesome video!

[@TheFrenchPug]

It's happening a lot more frequently. Chinese parts and bad OEM parts seem to be on the rise.

[@Diagnosedan]

Great to see you here! Thanks for taking the time to leave a comment it's appriciated 👍

[@-robster-robster-]

And when you see local parts factor companies delivering to main dealer stores to get a cheaper pattern part quicker than oe it makes me sad that some poor dude is paying dealer prices for aftermarket parts

[@sollykhan2385]

@@-robster-robster- it's happening a lot more frequently than you think, Euro Car parts sold the complete 4 wire Green coolant temp sensors on the day i rang for 1, when i arrived to collect mine, i witnessed a local vw/ Audi dealer driver collecting the entire stock from them, giving me no choice but to go there, and PAY THEIR PRICES!! worse was to come, it was a cheap Chinese obviously that failed a few day's later, when i returned it to the Audi supplier, was told it cannot be returned because it had already been fitted, and they couldn't resell it in that condition!! 🤥

[@jamiuajasa9367]

Boss comment on boss video 🤣 nice one guys!

[@Krotte96]

I think Bosch should be paying you a lot of money for doing their quality control!

[@Diagnosedan]

I already checked 2 sensors for them🤣🤣

[@palewriter1856]

@@Diagnosedan So next you're looking at negotiating your per-unit testing price? Good luck with THAT!!! This was a HUGE eye-opener for me, for which I'm WAY GRATEFUL!!! Your tenacity and dedication is BEYOND superlative! Sure, it helps to have all the necessary TOYS, but in lesser hands, that would NOT have been sufficient! WAY to GO, Dan!!! So - for one: I'm simple-minded enough to have thought (for YEARS) that if it wore a BOSCH label, it was FINE STUFF, against which all other manufacturers' products might be measured. REALITY CHECK!!! For two: your work ethic should be taught en masse -- so many youngsters today have NO IDEA AT ALL how things work in the real world work place, or what it means to wrestle a problem to the ground NO MATTER WHAT IT TAKES! For three: the tachometer tongue-twister: just call it a tach! (just like TACK) Old school. For four: THANKS again for the INSPIRING tale!

[@mgomez5606]

Get your money back for defective part.

[@palewriter1856]

@@mgomez5606 That doesn't even come CLOSE to proper compensation for Bosch's gross blunder!!!

[@markwood7346]

@@palewriter1856 chsers

[@mrblonde2013]

There's not many people who would have been able to find this. This could have been one of those "unfixable" cars or accidentally fixed with dumb flipping luck, without understanding what is actually wrong. You're the man Dan 😊

[@Diagnosedan]

Thanks!

[@lo1234-w9r]

The engine still ran with the old sensor but wouldn't start with the new. Why wouldn't you be able to figure that out? He probably could have avoided all of this and put on an OEM sensor to begin with.

[@juergenbertram7312]

@@lo1234-w9r , the engine started up, as long as the sensor was still cold !

[@johannadefeles2227]

Dan I would say the electronics in the module would recognise rpm on either negative or positive edge trigger of the signal but not both. Can be worked out from waveforms perhaps? Incredible company like Bosch could get wires wrong, possibly incorrect part number etc.@@Diagnosedan

[@noelconnor8539]

He certainly is theman😂😂❤

[@TheKeenMechanic]

You are an amazing technician Dan. Such an interesting video. Bosch should pay for all this and also recall all poorly manufactured sensors produced. One of my favourite videos. You can tell by the way you recorded this that you really enjoyed it as well🤝

[@Diagnosedan]

I did always nice when something simple turns into an interesting case!

[@ballebart]

You saved my day! 😱 I stumbled upon this video by chance and kept watching for a good reason! I’m just a DIYer trying to keep my Citroën AX from 1993 alive. It had the same symptoms: crank but no start. I already tried to diagnose many things with simple tools, but I felt out of luck and just thought, who cares, I’ll try switching pins 1 and 2 as you explained in the video, and see what happens. You should have seen my face when the engine started 😅Thank you so much for making this video!

[@DavidSuttoninSpain]

How can BOSCH make such a mistake? I am so glad that you sorted it out for the people well done Dan, for sticking with that problem a lot of people would have charged them the earth and not been able to fix it.

[@DavidSuttoninSpain]

@@dazaspc the same mistake twice? Some really intelligent storeman then, perhaps he should find another vocation. 😉

[@Diagnosedan]

What proberbly happens is that Bosch buys these parts for older cars from another party and sticks them in a Bosch packaging without checking

[@Random-nf7qb]

@@Diagnosedan What is probably going to happen is that I'm not gonna buy bosch any more :) Cheapskates...

[@frenchielovescars]

Not necessarily a Bosch issue. I have had the same thing on a clutch pedal sensor on a BMW. Imagine that for some reason you have 2 very similar parts that are physically the same but wired opposite because of the ECU they are connected to. 10 yrs after the car is not sold anymore the part numbers get superseded and no one remembers why there was 2 different part numbers and both get superseded by the same part.

[@neilmurphy845]

@@Diagnosedan That's it That's how everything's gone nowadays

[@WillieJu]

Another job well done Dan. So nice of you to help out people in need. ! Love your channel - keep 'em video's coming !

[@stoqnesko]

Job well Dan!

[@Diagnosedan]

Thanks Willem

[@Retirement_Life]

Nice to see you again, Dan. Who would have thought Bosch would have got their wiring inverted?! 😜

[@Diagnosedan]

Not me for sure, it would have safed me alot of time if i suspected anything like this!

[@JT-lq4yd]

If you look at it from another perspective, it is good that the wired connector is only for a signal and not for power. Otherwise, the ECM would be fried.

[@robertmedina6875]

Hey Dan you are a saint. My step dad was in a wheel chair and trying to get by on a 1000.00 a month American dollars per month!! He ended up with cerebral palsy from birth and was crippled in the chair. So because of this the American system works like they just don't give you very much if you have never worked in your life. Had he have worked he would have got about 1600 a month. Unfortunately his fingers were crippled and the only thing that he could do was pack O-rings in kits for a company called Clark equipment. They paid him 3 cents per kit. Needless to say we were very poor growing up. When they never forget my dad would have been happy. You're a good man Dan

[@JasonSpiffy]

You are the Eric O of Europe! Only difference is your shop is always quiete while Eric’s is loud!!! Keep the videos coming!!!

[@boosteddiesel1834]

Great video!, thanks very much. You were actually right, I never did expect that l, but hey it happens. In the words of Eric O “just because it’s new, doesn’t mean it’s good”. Good on you for sticking it out to the end. Keep up the good work 👍

[@Diagnosedan]

Thanks, and Eric is right!

[@mcautodatas]

Excellent diagnosis. This video proves that even new premium parts can be faulty and for different reasons. Great video!

[@Diagnosedan]

Thanks for watching!

[@TyroneMaye]

shows there charging way too much for those faulty so called premium parts... i wonder how are they verifying that the parts made from production truly actually work as they say they supposed to....🤔 for the cash prices there being sold to consumers for...i get it that without having a skilled tech with the wear with all to do what this mechanic here has done ....its same thing shop would be telling consumer X Y Z and the consumer would be in essence throwing money at the vehicle with out there being any real meaningful input to solve the problem... guess sometimes less known name brand parts work more efficiently then does the known name brand auto parts guess folks are participating in a crap shoot swhen it comes to purchasing some parts i suppose ...

[@robertshunter]

Never saw that coming! Truly quality content. 👍 Non-honorary *BOO-HISS!* for Bosch's failed quality control process.

[@Diagnosedan]

Thank you very much!

[@Troy_Built]

Must have been a newbie on that shift. I wonder how many made it out in that batch.

[@allankaplan8264]

Greetings Dan! I look forward watching your highly educational and informative professional diagnostic and repairs videos. Thank you for your great contribution to mostly DIYrs like myself! I have four 600 series of Benzes but my most respected one is my 1987 300D Turbo that has never failed me going back to 1991. She has been loyal and ingrained a respect for her after dependably drove over 238,000 miles since I owned it. I bought with 76,000 miles and the orignal owner was a mechanic and took good care of the car. About 2 months ago for first time car exceeded the normal running temperature. I changed the water pump, fan clutch, thermostat, temperature send-in sensor on the block as well as on the sensor on tops of the top hose housing. Also had the Radiator shop boiled and flushed the radiator. I made sure to remove any possible trapped air the engine etc. But she is still running hot. Very confusing. I also pressure tested for the head and the block leak test all checks out fine. You being a true wizard is my last hope before I retire my very loyal 300D Turbo and park in for good with my three other cars for I'll never sell this baby for her undying loyalty.

[@carlt6932]

You are one of the few that puts videos out that teach great techniques. Most need to be labeled For Entertainment Purposes Only. Thank you Dan.

[@hugh007]

There are probably thousands of those Bosch sensors at parts suppliers. Techs everywhere will be facing the same problem. Thanks.

[@Diagnosedan]

I wonder how many have been sold?

[@PineHollowAutoDiagnostics]

One word: MERCEDES!! ;) But at least the Mercedes was flashing the Crank Sensor code lol... Your Peugeot gave no clues at all! Now what signal was the signal generator putting out to be recognized by the ECM? Surprised that it worked because the ECM seemed very picky about the signal 🤔👌

[@mikesabin8568]

I have that same tool dan has. Autosim pro. It has presets. Just hook tool up to battery, go under sensor sim and choose crankshaft sensor. There is Hall effect and inductive choice, select inductive for this application and play with settings until you get read out on data pid

[@adotintheshark4848]

My '94 BMW 740 crank sensor started being intermittent as well, with no code. Finally it too quit altogether and wouldn't start. At the time I didn't even know it was the crank sensor until I had to try to get the car running again.

[@MicraHakkinen]

I suspect it's just that the ECU is designed to trigger on a specific waveform, for example a rising edge followed directly by a falling edge. There's probably a filter and/or waveform trigger in the electronics to eliminate noise and false triggers, which then only passes on a clean pulse to the rest of the ECU if it detects the correct waveform. And with the BOSCH sensor presenting the rising and falling edge inverted, no signal would ever make it past the ECU's input conditioning. Which would also explain why there was no fault code set: the ECU never even knew the engine was supposed to be running.

[@waterheaterservices]

We bought a new Volvo 264 in 1976 with the Renault Pugeot V6. I am still mad at France 🤣

[@clueless6559]

Ivan , the ECM if it could read the Bosch sensor it would think the engine was turning backwards when cranking with the reverse polarity sensor , if that makes sense , not come across a code for cranking backwards yet 🙃

[@GeminiSeven43]

I Love these video's especially when it comes to a problem that stumps the professionals like yourself. Bad parts are the plague of the future I'm afraid and your video showing the diagnosis and the use of the Pico scope to help identify these nightmares is a Blessing to all of us who don't have the real world experience that you do. Thank you so much Dan for taking us with you on these journeys into the unknown, you truly are a great teacher.

[@Diagnosedan]

Thanks for the great comment it's appriciated

[@englishbob5106]

🇬🇧 Bad parts are also a plague of the past also !

[@robertwilliams4327]

I am not surprised I bought a Bosch o2 sensor and it was NBG. Mech friend said they the wire them wrongly. GRRRRR.

[@paulisaaksohn9179]

Dan, I am totally blown away by your top-notch professionalism, work ethics, experience, superb skills and above all your relentless perseverance and passion for the trade, not to mention dedication to your customers for lack of a better term. What a blessing it would be to have you take a look at my car and consult you from time to time on some car issues. Keep up the great job!Shame on you, Bosch!You need to pick up the tab for all the trouble!

[@binagarten4667]

Every town every city, every country needs Dan. Clone Dan.

[@paulhutchins6019]

Wow, so well done Dan and credit to you for not charging a disabled customer for all that time, very honourable. I now work for a charity that has vehicles like that and the replacement costs are outrageous considering that there's not much in the back apart from the ramp and some chair attachment points. Some do have lowering rear suspension, but hard to justify the phenomenal prices!

[@bystander1489]

Charites are tax free

[@paulhutchins6019]

@@bystander1489 but the vehicles are not! We've just spent nearly £70,000 on one!

[@GNX157]

My guess would be because it’s all custom work and the parts are small batch plus maybe the huge costs of getting the vehicle crash test certified again? And of course since insurance probably pays in many instances, that will immediately make the costs be higher.

[@paulhutchins6019]

@@GNX157 but the vehicles use type approved modifications so they don't have to be individually certified 🤷🏼‍♂️

[@GNX157]

@@paulhutchins6019 I didn’t mean individually vehicle approved. I mean that overall model car retested after the disability system kit was designed for sale.

[@marcioreis2648]

Great diagnostic again Dan. I would never think of a Bosch part to be that messed up. But you fixed it again. By the way once this Pandemic and invasion is over I'll pay for all the expenses to fly out to you and help you for free of course , that is if you ever need anybody. P.S. I've been working with diagnosing and fixing just about anything on wheels an on water for the longest time and noticed a few parts that are counterfeit with brand names on them. Sign of the times I guess.

[@gailtaylor1636]

Only have to swap the pin locations in the connector. Simple fix once you know the problem. Like when the 70 year old machine quit in a factory and nobody knew how to fix it. They called an old guy that used to work there and asked him. He came out with what looked like a doctors bag. Laid out 3 things. Stethoscope Chalk Big rubber hammer Walked around and around the machine listening occasionally with the stethoscope. After few minutes, drew a big X on the side of machine. Picked up the rubber hammer and gave it a big old whack. Machine sprung to life!!! Wrote up a bill for $18,000. Manager screamed about the fee. Said he wanted itemized bill as he wasn't paying him for hitting it with a hammer. Bill said: Labor---$10 Knowing where to hit it---$17,990 They paid the bill!😂🤣😂

[@TheFrenchPug]

I'd like to go with you. Would be a great trip!

[@Diagnosedan]

Yes fake parts are a problem, but what i think happed in this case is that Bosch buys these parts for older cars from another party and sticks them in a Bosch packaging without checking.

[@tjroelsma]

A French car with Italian electronics, what can go wrong? Seriously, I wouldn't be surprised if Magneti Marelli originally used some Italian cranksensor that's fully identical to a Bosch but with some connectorpins swapped. It wouldn't be the first time an Italian company used a "trick" like this to sell their own product. So I don't think it's a Bosch problem but rather a Magneti Marelli problem.

[@daveklassen7052]

@@Diagnosedan I think the parts were intended for the UK market, where everything is left-handed ....

[@darrollfryer628]

Dan I just want to say is thank you for the great video more then anything not charging the customer that even made it the best video ever. Due to an accident I am also handicapped but as a technician that I was I wished I could have done more for the handicapped just because they have a lot of outgo on their end from their income and no one to help so that they can survive and live at a little better than what they are now believe it or not just what you just did help them out the most anybody could have ever done God bless you for that and I wish more people were like you keep up the great work keep putting out these great videos I love them it gives me something to do and once again thank you from the bottom of my heart

[@Diagnosedan]

Hi Darrol, thanks for your comment, the owner was very gratefull, that was worth more than money

[@octaviansorescu7427]

So much patience and determination!!! Formidable! A real winner! For three months I have been looking for information about the EGR of the Vw Golf 6 1.6 tdi. Now I know absolutely everything about him. The problems that arise, mechanical, electrical, working parameters, every electrical connection, absolutely everything! Good luck! We are waiting for new episodes!

[@brathishan5611]

Discovered this channel 3 days ago and binge watched all the videos, look forward to more. Thanks Dan.

[@Diagnosedan]

Ha ha that's great, thanks for watching my video's its really appriciated

[@whathasxgottodowithit3919.]

Would a genuine OEM part have worked? Great diagnosis by the way

[@BlarginBro]

I believe Bosch is oem

[@Diagnosedan]

Yes it proberbly would have. The original was made by Siemens.

[@markmagee2382]

Whow, I’ve never been into diagnosis as was way above my head but you provide it in such a simple way it’s easy to follow. I’ll be more sceptical of branded parts in future if replacing and no cure. Thank you and brill sorting that car out for the owners, their mobility will have been so important for them 👍

[@Diagnosedan]

The owners were very gratefull !

[@The_Redkween]

Time for another Diagnose Dan video! Can’t wait! Already liked and ready to go!

[@jimyep9971]

Same here

[@Diagnosedan]

🤣🤣👍

[@spelunkerd]

It's nice to see you do some more complex diagnostics, even though I understand how it might mess up your shop work flow. I was surprised this crank sensor is the old style VR sensor rather than a hall effect sensor. What an interesting final diagnosis.

[@Diagnosedan]

Its an old car😉

[@TyroneMaye]

what's the difference between the VR sensor and the Hall Effect sensor ?

[@spelunkerd]

@@TyroneMaye Variable Reluctance sensors produce their own voltage by placing a magnet and a coil beside a steel toothed hub that rotates by, and it produces a sine wave that varies in amplitude and frequency. They have two wires. Hall effect sensors have at least three wires, they require input voltage and ground, they have internal electronics that produce a square wave from a rotating magnetic strip. They are more expensive, more delicate and more accurate, especially for slow rotation rates. Wikipedia has more detail.

[@TyroneMaye]

@@spelunkerd thank you for taking the time to explain the difference of them both to me.

[@dblomvo7732]

Scary, when used good OEM parts and don’t work, but it happens. Thank you Dan, appreciate you. My prayers for you and your family for abundance of blessings. Stay safe peace

[@wyattoneable]

I sure appreciate that you did this process all over again. I always learn a lot here. Oh my goodness, that was it? Wow. I don't want to give it away but that was very interesting and yes, who should pay for that? A great question.

[@Diagnosedan]

Normally i wouldn't bother filming something like this, but this one turned into something special🤣

[@konezoumana614]

Very good lesson. Always happy to learn with you. Thank you so much Dan!!!

[@Diagnosedan]

Thank you!

[@spyderlogan4992]

Crank position sensor: 1) Original=Bad, 2) 1st spare=mis-wired, 3) 2nd spare=mis-wired, 4) 3rd spare=wired correctly. Wow. Well Done Dan~!!!

[@Diagnosedan]

Yes this was a strange case, it took me way to long

[@Diagnosedan]

@@dazaspc you are right but this is what happens sometimes and can be part of a diag when parts are available.

[@mikeclinch1141]

Love the video - glad to have found you - I was a commissioning engineer on control systems for a few years and this brings back those memories - when you check it all out and cant find the problem and you go round in circles a few times trying random things , anything, until you eventually solve it, then try and explain to the office why it took you hours to get there - made me smile - thanks !

[@billrimmer5596]

Good morning Dan. I just watched this video again. Repetition is the mother of retention. Thanks again. It’s gloomy and rainy in Sunny California

[@wurlycorner]

Sure didn't see that one coming. I thought it was going to be something far more plausibly random like an immobiliser switch wired into the aftermarket rear hatch/wheelchair ramp setup, to inhibit starting in case that wasn't stowed correctly! Would love to know what Bosch have to say about this?

[@gailtaylor1636]

Exactly my thought too. It was too simple.

[@Diagnosedan]

Maybe Bosch Will respond😁

[@Prometheus1954]

Great video Dan. That is so mess up that Bosch got the wiring reversed on the sensor. Great job as always. I do enjoy to seeing your approach to solving issues like this.

[@Diagnosedan]

Thanks Steven, i see this happening more often and its not just Bosch

[@Prometheus1954]

@@Diagnosedan I see it too in alternators starters and other sensors here in the USA.

[@katadafareed6651]

Great work Dan, I had a similar experience with a V8 Audi 80 for a friend collecting dust for years, using the oscilloscope function of Carman Scan VG+ it turned out the timing pin the crank flywheel was broken.

[@Diagnosedan]

Great find!!

[@DenHollender]

Just discovered this channel recently, love it! This is what mechanics is all about. Pinpoint the problem and fix it. Not only fix it, it was fixed after installing the "cheap" sensor, but also find out why the Bosch sensor didn't work as it should. Keep up the good work Dan, you've got a new fan here!

[@andythomas7931]

OMG what a brilliant feel good video bless you Dan for helping the owners. I felt like I was watching a Hollywood movie at the edge of my seat. FANTASTIC!

[@PhillipBailey]

Funny thing I was mentioning this to my students today about a magnetic pulse generator being reversed polarity. I've seen that before several times but those were due to someone replacing the pigtail in the harness. One was on a Caddy with dual crank sensors for redundancy but with one signal inverted the ignition module would not process either so crank no start. You would only catch this with a lab scope but you need a known good signal for comparison. Another was on a GM 3.1 were the wires were crossed and it acted like it was out of time. It would fire but not run and then foul the plugs. Good find. I would not have expected this from Bosch. I usually try to use oe sensors whenever possible.

[@Diagnosedan]

OEM is the safe choice when it comes to sensors!

[@sidm3300]

A very interesting video, and very well presented. Subbed straight away. As a mechanic in the 60's and 70's I'm amazed at how ridiculously complicated cars have become. I left the trade in '76 and didn't get involved with it again until I retired from working eight years ago. Since then I've watched all kinds of videos of this sort and finally found your channel. You have a great way of explaining things and I'll be binge watching all your content.

[@Diagnosedan]

Thats great to hear, thanks for Subscribing!

[@Karelvermaere]

Hi Dan, great video! Brought back some memories as I had the exact same issue a few years ago on an old renault scenic. It had a bad crank sensor (also inductive 2 wire, the ones on top of the gearbox mounted with 2 M6 bolts) when you buy a new one most of the time it comes with a new connector they want you to solder in to the cars wiring. Probably because these connectors go bad easely. I don’t remember the brand, but they also had the colors switched on the new connector and after installing we had a no start. I was looking on the scope for full 2 days until I found that indeed the signal was inverted and the ecu did not see this as a problem but just ignores the signal. So when I knew this I just had to switch the 2 wires and the car started right up. Very very frustrating! So thanks again for this video, I’m sure it will help some people out. Take care! Karel

[@imperativeemarketing5546]

I liked your video and I'm going to watch more of them. I ran across your video doing some research for a 1998 Dodge Dakota occasional stall problem. As a former California state licensed smog mechanic (1990) your video reminded me of the good old days when I worked in a shop and whenever they had a vehicle diagnosis which no one could figure out, they would give it to me and I would solve it in no time. It's been a while, but I know I'll have no problem with the Dodge... and I'll enjoy watching some more of your videos... thanks for the great entertainment.

[@davidbarton7463]

Happy days when you can fix at another level, your smile says it all. Well done I'm proud of you.

[@4l5m6e1n]

great video Dan! I thought Bosch was supposed to be a reliable brand, but apparently not.

[@khalidacosta7133]

I stopped buying Bosch a while ago when the quality dropped. Maybe it's just for aftermarket parts, with OEM products still being made in house but aftermarket, source out production to cheaper manufacturers I reckon!

[@Diagnosedan]

I think they buy these parts for older cars from another party and sticks them in a Bosch packaging without checking.

[@davyboy380]

Good man Dan, your a diamond of a feller for helping others who are in need and also teaching others the tips and tricks of the trade. Great videos Dan..Thanks mate.

[@Diagnosedan]

Thank you David

[@bernardaflores1720]

Great video, it just shows you how crazy the aftermarket parts world is with bad parts, fake parts and lots of quality issues. We are buying used OEM parts to replace does that fail. You at least get a much better part at a lower price point.

[@Diagnosedan]

OEM is the safe way to go for sensors for sure!

[@ralfeotto4468]

Dan, my respect for figuring this out. I understand the the frusrationt however in eliminating one path over another a brilliant result.

[@Diagnosedan]

Thanks Ralf

[@marvelaturraz5405]

I immediately suspected the crank sensor at the very start of this video. But I would have been so screwed anyway, because it never would have dawned on me that the polarity of the damned sensor ITSELF (especially from a name brand like Bosch) could be the problem! I'm very impressed, Dan. Thank you for sharing this. 🙏🏼

[@HelgiThorisson]

Great video. Throughout the years I have seen a few faulty new parts. They are not always cheap aftermarket parts. It is frustrating that you can not rely on the new part being okay. Are we supposed to test all the new parts before installing them? Who is paying for that? Actually someone could start a new business that evolves around testing parts before they are sold over the counter. 😀

[@TheFrenchPug]

We truly do need something or someone that can test them before installing. There is no more quality control from the manufacturers apparently.

[@flaviokonti5522]

And who is gonna pay for testing? I dont think manufacturers have intention paying for something they were supposed to do in the first place, let alone pay somebody else to test their shit. And I dont think customer will want to knowingly buy untested product and then take it to somebody for testing and be additionaly charged for this lol. Thats why you have consumer rights to return any defect product and have another one or money back, and store then returns the faulty part to manufacturer. The only one who is at loss here is car technican who wastes time and cant charge it to anybody, but then again thats why they charge replacements at premium timings so its a closed circle 😂

[@Diagnosedan]

🤣🤣👍

[@blockbertus]

What I learned from a bunch of friends who are fans of french cars is that you should never mix french cars with Bosch parts. At least not when it comes to ignition related things. I guess they were onto something... Edit: Looking at the wave forms, it appears as if the polarity of the Bosch sensor is reversed. Edit 2: Oh, you also noticed that... Oups.

[@Diagnosedan]

🤣🤣👍

[@gerhardvandenberg7249]

@@Diagnosedan What I learned from this video. If it doesn't work after you have tried everything...... Change the wires around ...... OOOPS!!!!!! 😜😎😭

[@ehsnils]

This was really an interesting one, I started to think that maybe the ECU wasn't properly grounded since I have experienced that once. Sometimes you need to pay a bit to learn a lot more. This is also why I don't fully trust codes given by an ECU.

[@Diagnosedan]

Thanks for watching!

[@MrBrander]

Yeah. The error codes given by the ECU are only as smart as the ones who designed them. Also ECU error codes require a lot of sensors and other ways to follow and diagnose the engine condition to be accurate. Fewer sensors and methods more approximate and thereabout the error codes are.

[@mollyhackman4910]

That is a lesson that everybody learns, eventually. Sometimes the new part is no good. Let me tell you this one had me going all the way to the last. Good job man, thanks for posting the video.

[@raymondhardie3880]

Amazing and so telling of faulty new parts. I have ran into similar problems not only with electrical sensors and switches, but also with mechanical parts that were not properly built and failed to work thereby causing me to go thru different manufacturers of similar parts in order to get a correct working replacement. Thank you for posting this video and identifying a problem which was overly exasperated due to poor quality replacement parts.

[@sid-craftbuilder675]

Dan, Just ran across your channel and love it. There is a channel by Mr. Carlson's Lab and he is a genius when it comes to electronics (radio, etc) and after watching several of your videos, I must say you are a genius when it comes to automotive diagnosis. Very educational watching you chase down and fixing problems. Please keep doing what you do best.

[@Diagnosedan]

Thank you very much, i'll have a look at Mr. Carlsons channel👍

[@isalmankhan1]

Awesome👍 Thanks for sharing Dan👍 It could be easily a part's canon, especially when the signal was making it to the PCM, indeed a very tough one, but you fixed it😍 DiagnoseDan Fixed it Again, Stay Safe Bro❤

[@Diagnosedan]

Thanks!!!

[@adrianvalbuena8158]

When I teach automotive electronics I always bring my old electric guitar to my class to see the phase phenomenon on inductive sensors, it has a pickup setup to invert one of the signals from a pickup, so it sounds like chorus effect when mixed, we use to record smoke on the water using inductive sensors XD, and we can see the signal pattern on the pico. VERY good video Dan, keep this line, I love it!!!!!!!!

[@Diagnosedan]

Thanks for watching and leaving a comment it's appriciated

[@dubblyewjay1133]

Ok! I need you to build me one for me to play SOTW, the forbidden riff in music stores.😉

[@viktortoghia6066]

I have also been in this industry for 20+ years and seen the new parts more and more times being defective. It is hard to do your job when you expect the new parts to be good and they turn out bad. Great job, love your chanel.

[@dalehamlin7383]

The very best automotive channel on KZbin by far. Pure entertaining enjoyment and highly educational. Thanks for taking the time and patience to share this with us. You are a true leader in your craft....!

[@Diagnosedan]

Great comment! and thank you for taking the time to leave a comment!

[@The_Redkween]

Awesome video as usual, Dan! I was guessing a 5 volt ref getting pulled down and was wrong.

[@dennisphoenix1]

It was a good guess . 😉

[@Diagnosedan]

I also thought that at some point and checked that. Could have been!

[@marshallgoldberg8376]

That is so impressive! You are a master at what you do, and I have so much respect for your support of the disabled.

[@Diagnosedan]

The owner was very gratefull! It was great

[@josephbeltramini5442]

Dan doesn’t have problems, only solutions.

[@Diagnosedan]

😁👍

[@Kayakeryul]

Amazing case study!! Thanks for sharing with all the details and the final (the fix...a great finale!!!). will watch it again.

[@elelectricistademateo]

thank God at last another diagnoseDan video - was about to get the next bank around my town and "borrow" some money to go to Holland and start asking for you - long trip equal a lot of money - lol - thank you one more time Dan for sharing your knowledge with us -

[@Diagnosedan]

🤣🤣👍 Thanks for the positive comment

[@DTEAuto]

Thank you for sharing this one with us all, as always with these type of diags , persistency is what pays off in getting to the end. Not too mention the power of the scope to be able to let you "see" the "why" to the situation of one sensor working and the other not. Appreciate all the effort as always!

[@Diagnosedan]

Thanks for the great comment it's appriciated

[@Alanw74]

Interesting to see what Bosch have to say about this.... You expect better from them

[@Diagnosedan]

Maybe we get some feedback from them

[@HashiriyaSquadron]

At first I thought you may have overlooked a blown ECU fuse or a broken signal wire to the ECU. But good work as always.

[@Diagnosedan]

I have checked all of that😯

[@crs1474]

Awesome awesome work Dan 👏 not just for the video and work you put in it but also for your generosity in helping the vehicle’s owner. 🙌

[@fivedotsdave9723]

Dan, that was a great educational lesson, you are a very generous person by helping that family in their hour of need....

[@Diagnosedan]

The owner was very gratefull

[@chewykarma]

Easy to get caught up in the weird science of the repair, but it is Dan's dedication to making a plan and then working the plan that was the big takeaway for me. “Assembly of Japanese bicycle require great peace of mind.” Robert Pirsig.

[@Diagnosedan]

Thanks for the comment

[@stevehayes7921]

Dan, you have a lot of patients my friend, but we'll done !!!!

[@Diagnosedan]

😁👍

[@Peter-od7op]

God is watching over you. So proud you helped out the handicapped.

[@제이씨오토모티브]

You're world best mechanic. I've not seen before in KOREA and other country regrding for your exact explanation. Thanks for providing your good resolution process. As you know many people don't open solutions.

[@Diagnosedan]

Thank you very much!

[@markhale4255]

I’m in Florida, you blew my mind!! I have an 2007 gmc 1500 4x4 I rebuilt my Motor. Crank no start first same 3 try it starts , runs great . But still crank no start . I replaced the camshaft sensor . I will buy a gm sensor and give it a shot. Thanks so much for sharping a great video

[@atlasxxiii]

Bosh needs to pay for it and send you a thank you card with a prime restaurant card for the whole crew. You just saved them a law suit

[@BaronRosenhein]

Job well done Dan. A lot of old(er) ECUs specifically watch waveform transition on the missing tooth to detect if the engine is rotating in the right direction. For the Bosch sensor to work just reverse wires at the sensor connector (or ECU whichever is easiest). Just something to keep in mind.

[@cyclingluke9412]

That’s what he did at the end of the video….

[@mechanior6483]

another good job, you should upload videos more often, even for simple repairs. it's invaluable learning to be able to watch you solve even the most complex faults step by step. I've been watching you since you had 10,000 subscriptions and you still surprise me, you do it great. Greetings :)

[@Diagnosedan]

Wow thank you for sticking with me for all these years its appriciated

[@jamesjames7025]

Make sure your Meedle works..lol Thank you for this video and the importance of having the right tools for the job. I never woul have been able to " see that" without a oscilloscope and you prove it time and time again, determination, organization intuition and a whole Lotta patience! Thank you , excellent video!!! 👏

[@Diagnosedan]

🤣🤣👍

[@StoneKathryn]

I had a no crank, no start. Replaced starter motor. Battery okay! Alternator okay! Fuel fine! Bad positive bolt into side terminal battery! Crazy! Two threads had worn away so it wasn't connecting well enough to the battery! Problem solved! That was wonderful to follow your deduction and analysis of the problem. That was amazing that the signal on the Bosch cam shaft sensor was inverted! Production problems at the factory! It was great that the off brand sensor worked! Kudos to you!

[@kevinpalmer7452]

Very interesting case Dan I have to admit I’d run out of answers after seeing what appeared to be a good CPS signal at the ECU. Couldn’t help but notice what amazing condition that car is in for its 22years well worth the effort

[@Diagnosedan]

Yes the car is in great shape!

[@michaelovitch]

I would have thought to a sensor wired for a different rotation Honda engine from the same era recycled for Euro brands. If it had a clutch replaced ,i would have said that the flywheel tone ring pattern is not the good one. Nice work,i'm sure you was pissed off a bit by a "free" easy job you understood nothing about at a point.

[@Diagnosedan]

Wow there are so many people in the comment section with this problem on motorcycles

[@michaelovitch]

@@Diagnosedan Honda cars,they rotate the other way.

[@jamesbrown2163]

@@Diagnosedan I am looking at your channel, hoping to get lucky finding a way to diagnose and fix my BMW R1200R. It won't start without holding the throttle open. Runs super rich at idle. These bikes don't have MAP sensors. They rely on the throttle position sensor to tell the ECU how much fuel to inject. I bought an oscilloscope to try and work out what is wrong. Your Video has inspired me to have another go at diagnosing the problem. You are a Legend Sir. Thanks so much.

[@nigelcox1451]

Present the video to Bosch and ask for a contribution. Right now, all your viewers are plannign to avoid Bosch parts. A poor response from them reinforces this decision. A good response from them could undo the damage, and repair their reputation. Are they wired wrong, or are there two different ones, and the wrong one is listed for this vehicle?

[@Diagnosedan]

It could be that this sensor works on another model! But this one is listed in the catalog

[@TheDaf95xf]

That was absolutely amazing Dan 👍🏻 Your generosity on doing that for free was very admirable 🤩🏴󠁧󠁢󠁥󠁮󠁧󠁿

[@fascistpedant758]

Mercedes once flipped the signal from one MY to the next. If Renault flipped it midyear, you might just have the wrong part. It would be interesting to compare the part numbers listed for the previous and following years.

[@Diagnosedan]

What proberbly happens is that Bosch buys these parts for older cars from another party and sticks them in a Bosch packaging without checking.

[@arifharichund8829]

Thank you Dan. Your video confirms the quality of parts being sold. It is very dangerous if weak parts are supplied for engine or brakes... which can be hazardous to the engine or ones safety😢

[@bigmotor3845]

I had the same problem with an older Volvo almost 17-18 years ago. Great job DD!!

[@partero01]

Unbelievable I know nothing about cars, but got hooked on how you diagnosed this problem! I also loved the outtakes - Tac - Om - Meter (RPM gauge ).

[@phyllismassey5780]

Thanks so much for this informative video. I'm not a mechanic but grew up near many. Just a woman who isn't afraid of learning how to make repairs on my own vehicle.

[@neverstoplearning382]

Wow that is crazy. I see all the comments and realize how we all learn from each other. Great job Dan

[@Diagnosedan]

Every day is a learning Day!