How to read, scan for and clear error codes with the diagnostic tool on the Volvo 850, OBD1 - VOTD

In this video it will show you how to read and reset the error codes using the on board diagnostic tool under the hood of the Volvo 850 cars built in 1993, 1994 and 1995 model years. Many codes in this system do NOT set off the CEL (Check Engine Light).
Port Choices
A1 Transmission
B1 Climate Control
A2 Fuel System
B2 Cruise Control
A3 ABS
B5 SRS
A5 TCU (Transmission Control)
B6 Power Seat
A6 Ignition System
A7 Combined Instrument
Link for code information: www.matthewsvol...
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[@ericmoulaert8406]

Robert, your videos are absolutely great and explanations are crystal clear to easily maintain my Volvo 850. Many thanks

[@RobertDIY]

+Eric Moulaert thanks for watching.

[@yoson486]

By far the most helpful person on youtube for car issues. Having gone from volkswagon to jeep to now volvo these videos are the most clear cut and easy to follow i have ever seen

[@RobertDIY]

Wow, thanks!

[@nateteng2424]

Thank you sir, my check engine light was on for about a year. I tried everything and could not remove it. After watching your video, and 10 minutes later the light is gone. Thank you so much, god bless. I have a 95' 960 model, thanks again sir.

[@RobertDIY]

You are welcome.

[@berryelectronics]

Thank you Robert. I tried disconnecting my battery for 15 minutes to clear my check engine light, however it's still on. I will try this. Your detailed directions have me feeling confident. Thanks again for keeping a lot of good vehicles on the road with your help. Just A little note: I have a 95 Volvo 960. The OBD boxes are located near the drivers side hood hinge.

[@berryelectronics]

Just a update. This worked flawlessly. Thanks again Robert, your a blessing.

[@RobertDIY]

cool, thanks for watching and sharing.

[@stephenclinton07]

You put alot of effort into your videos... Thanks for all your help through out the years!

[@RobertDIY]

you are welcome.

[@5lwrf3]

Got the codes cleared and too the car out for a spin. It died suddenly after about 1.5 miles. Tried the diagnostic tool again and All the test ports on the A side show 1-1-1. I am at a dead end with this car. At least I know that I have tried and with the help of your videos, I feel that I have done my best. Wife wants to donate the car to NPR now.

[@RobertDIY]

What kind of car is it?

[@RobertDIY]

kzbin.info/www/bejne/hIjJfaOmbbOYrKs

[@YolieW]

Thank you Robert. I have learned so much from you to help me keep my 1995 Volvo 960 running well.

[@RobertDIY]

+Yolie W good deal.

[@user-tn3je7kw6e]

Are they good cars? Any transmission problems?

[@camicatzelg]

I spent hours, because the led shone very poor. Man I forgot to deactivate my engine immobilizer with the little pinstick. After doing that I was able to read and delete some codes. Thanks Robert

[@RobertDIY]

+camicatzelg you are welcome

[@kevintango946]

Robert thanks for never ending videos that helping lots of us, I have 97 volvo glt 850 but didn't see that two stuff where it says A and B where can I clear code just in case I have some, i knew have some ... have a wonderful new year to u and your family...thanks Robert

[@RobertDIY]

+Kevin Tango only on cars built 1995 and older.

[@5lwrf3]

Got It! I found the 121 code for the MAF sensor at A2 on the on board diagnostic tool! Thanks! Now I know I can buy a new sensor without wasting my money. I tried to clean the sensor already and it did not fix the problem. Car stalled about 1/2 mile from home and would not start again so I had to have t towed back home.

[@RobertDIY]

Sometimes you can unplug the MAF and it will start.

[@5lwrf3]

@@RobertDIY I should have tried that. The next day, the car started fine at 3 different times in the driveway. I tried to start it with the MAF unplugged and no go. I am going to try to check the camshaft position sensor today just in case.

[@RobertDIY]

ok

[@nedkuypers4223]

Thanks for all your great videos Robert. Could not have serviced my 850 turbo wagon without them! Thanks again and keep it up.

[@RobertDIY]

You are welcome

[@cannedpixels]

Thanks Robert. You are a generous person to share your insights with these well presented videos. My1999 v70 T5 and I will be much healthier because of you.

[@RobertDIY]

Thanks for watching.

[@jorgkaczmarek291]

fantastic...thank you, you help me to drive my 850 since years!

[@RobertDIY]

+Jörg Kaczmarek Good deal.

[@dannywalters1548]

This is going to take forever! The video is perfect. 1st ODB1 car in awhile LOL. Thanks man.

[@RobertDIY]

You are welcome

[@cwmoriarty]

Another great video! This OBD1 system was in the post-1989 240-740-940 (Bosch LH2.4) redblock engines too.

[@RobertDIY]

+Christopher Moriarty are the codes the same?

[@cwmoriarty]

Looks like until 93, they're the same DTCs: www.troublecodes.net/volvo/

[@jorgkaczmarek291]

your help is so good, my son bought a 850 too, because i wont gibe my to him...because of you

[@RobertDIY]

+Jörg Kaczmarek LOL, Thanks for watching.

[@iggaladi841]

What a helpfull video Sr.!!!! Thank you so much. I´m having some inyection trouble with my 850 T5R, and this video will help me out for sure. Thanks a lot!!

[@RobertDIY]

+Santiago Morro you are welcome.

[@kongenisinghetto2327]

Thanks Robert now i dont become mad everyday when i see the check engine light.

[@RobertDIY]

If you have an old car, you need a scanner (OBD2 Tool).

[@kongenisinghetto2327]

Robert DIY i followed the steps in the video and my check engine light havent come on for 5 days.

[@bodiemanly365]

Hey Robert, thanks for the great video. I have used it to pull codes off my 1995 850 OBD-1 in the past. Right now when I use this technique I can only get codes from A7. when I plug into the other ports and hold the button for the same amount of time, it doesn't flash any code. No flashes at all for anything but A7, and I'm not able to reset the codes. On some of the other spots it dimly shows the red light when I plug it in, but on others, no light at all. I wondering if I need to replace anything in the plug system? Any thoughts for when it flashes for one but won't flash anything for the others? I'm pretty sure it has codes stuck in some other places that I've gotten codes in the past (like A3), and that's stopping me from resetting.

[@RobertDIY]

Probably needs to have the box cleaned out or replaced.

[@zerocooldown7101]

This video helped me a lot ,thank you sir 👍

[@RobertDIY]

You are welcome

[@Ronellj]

Thanks a lot on this video ! Explained and helped me trouble shoot and further investigate some issues i was having

[@RobertDIY]

+Ronell “Ronl” J Good deal, thanks for watching.

[@thelibrarybrat]

Robert, I use the videos and like them. I noticed on this video that you are about to reset terminal 2 and then the video shows you on terminal 3?

[@RobertDIY]

Ok

[@melonjm6843]

Robert DIY what does it mean Ok?

[@Ez_Sol]

I were wondering about that also.

[@kocaarik]

Thank you once again Robert!

[@kocaarik]

This guide worked for my 1995 Volvo 960. Had the lambda light on which is the same as check engine light I guess

[@viktorbpunkt1119]

Thank you from Germany 🇩🇪 👍🏼

[@RobertDIY]

You are welcome

[@charlesglee3757]

You have been alot of help with my Liyah. Keep sending these videos Can this be done on the 1999 s70 model

[@RobertDIY]

No, if you own a Volvo, you really should purchase an OBD2 tool.

[@spodface12]

Hiya Robert. My old 850 is as base spec as it gets. And it's not got all the A numbers. Only A2 A3 and A7 no loose wires or anything. It's a 1994 850 estate. Looking to try and get to the bottom of a lambda light lol

[@RobertDIY]

You may need to drive the car until the light comes on and then check it while the car is running.

[@markwitteveen6671]

Thanks Robert. Still relevant! Got 2 codes. The A7 Port gave 1-2-2 “temp sensor interval too long”. Can’t find specific answer online. Does this mean the coolant temp sensor? Keep it up. Greetings from Holland

[@RobertDIY]

That's what it sounds like to me. If the wires are connected properly, I'd replace the sensor.

[@patrickjmckenna]

Awesome. Thank you Robert!

[@RobertDIY]

+Patrick McKenna you are welcome.

[@TheManaCake]

Helpfull video as usual!!!

[@RobertDIY]

Thanks for watching.

[@lennartjonsson9367]

Hi, thank you for The information. It really helped me out with my problem. Tack. (swedish).

[@RobertDIY]

Glad it helped!

[@sjbock]

Several of the A ports in the OBDI box on my 1994 850 don't light up when i press the button. If I remove the box to clean the contacts is it safe to use isopropyl/rubbing alcohol, 70 or 90%? (I don't have electrical contact cleaner.)

[@RobertDIY]

sure.

[@rumenkostoff]

You are amazing. God bless you!

[@RobertDIY]

Thanks for watching.

[@kgbraikinas]

Hi Robert. Thanks for the help. Quick question. On A2 section i got error code 122, but its not on your list. What that means?

[@RobertDIY]

I think it means that the car has not reached the speed required to test that system during that drive cycle.

[@SpinachManBigly]

Hey Robert, for some reason somebody snipped off the wire on the diagnostic tool on my Volvo. Could I just use a jump wire(like the one from your fuel pump relay video) to do the code reading?

[@RobertDIY]

you can re-connect the wire. It likely broken off.

[@luismontero1945]

Hi Robert I have a Volvo 95 850 the on board DTC Red light come on but don't blink check engine light is on I guess it no functioning properly I plugged on 2 press light come on but don't blink ..? what's wrongs?

[@RobertDIY]

My guess would be that the box is bad or has a bad connection.

[@j718wn]

How do I clean the ports?

[@RobertDIY]

Unplug the unit and spray the connector and ports with electrical contact cleaner. Then re-connect them with dielectric grease..

[@rogerhaas8773]

Robert, thank you!

[@RobertDIY]

You are welcome

[@andrewbrubaker1366]

thanks I will get to it tomorrow it is brutal code in Pittsburgh.

[@RobertDIY]

+Andrew Brubaker I believe you.

[@TheRealXesc]

What a fantastic video, so much valuable information! If you only knew how few mechanics know this about our old Volvos... I have a Volvo '92 960 ;-) I do have one question - It looks like that between you reading your error codes, and you resetting your codes, you had moved the jumper cable from port 2 to port 3 - is that correct? And why?

[@RobertDIY]

Different ports are for different systems.

[@mvkboats9879]

Hello, please can you tell me how i can read codes on a 850 2.5 TDI from 1996 ? my OBD2 scan tool does not work on this car.... thank you in advance

[@RobertDIY]

get another scan tool.

[@QkjajshsjajaCcccc]

Hey robert, I have a 850 with a fresh replaced battery and wires. I run thru the codes and its all codes for sensors.. after reseting the check light goes away, but when restarting the computer thru ignition key the light comes back. Im fairly certain my sensors are all good.. any fixes? Thx

[@RobertDIY]

If you have error codes something needs to be fixed.

[@Jaite-te6fj]

Im trying to clear the lambda ligth but even if i hold for 10 seconds them wait them hold again 10 seconds, it wont reset it, it will just repeat de error codes, what can i do?

[@RobertDIY]

fix the problem.

[@hristoanastasov9495]

Thanks a lot for yours videos!!! Do you know, for what is this green wire with red band wich stay infront on OBD1 box? Thanks in advance!

[@RobertDIY]

No idea

[@williamarenas2093]

I noticed you started working with A2 port (fuel system airs) and then without any reason, you changed to A3 port (ABS) and then reset the port. Can you explain that? Why you changed the port? If we get the "check engine" message how we know what port we need to start working with? Do we need to buy a special tool? and if this is the case what's the name of it? Thank you in advance for your answer.

[@RobertDIY]

Huh? I was simply showing you how to read and reset the system.

[@joonas8848]

I have 740 92" and When I'm trying to read error codes my obd don't blink any advice?

[@RobertDIY]

Unplug it and clean the connection.

[@2Small2Fail]

Robert, if I'm correct that this applies to the 960 as well, what I just discovered trying to check transmission codes on my 1993 960 (OBD1) is that instructions I find online say to plug the test lead into hole #1 to run this test. Problem is: when I check the OBD unit, hole #1 has no wires going to it. The harness that feeds the OBD unit A (there are two) only has wires going to 4 of the 8 holes, by design. And hole #1 is not one of them. Your thoughts? Thank you!

[@RobertDIY]

It may have an internal link. Does anything blink when you jump that hole? If not, you'll need to check a manual to see which port will give you transmission codes.

[@2Small2Fail]

@@RobertDIY Nothing blinks, which was my first clue something wasn't right. At the very least it should give me a 1-1-1 reading. That's why I started looking at the OBD unit itself and discovered there is no wire to the #1 port. I'm following instructions for the pre-'96 960s with the OBD1. The instructions are the same here: www.volvotips.com/index.php/940-960/volvo-960-service-repair-manual/volvo-960-automatic-transmission-diagnosis-service-manual/ AND here: www.volvoclub.org.uk/faq/TransmissionAutoAW30.html#OnBoardDiagnostiCodesforAW3040SeriesAutomaticTransmissions No matter, I just thought you might have run across this particular peculiarity and have a thought on it. I was hoping to make some progress this weekend, but I can just ask my Volvo mechanic on Monday. I appreciate the quick response.

[@kouamsama6987]

hello Robert, i have a 1996 850 GLT. It does not have the jumper box and i have the CEL, ABS and SERVICE lights on. the Service lights comes on and off, any advice on how to get rid of the lights.

[@RobertDIY]

kouam sama kzbin.info/www/bejne/gKKYnpuldtZ9erM - kzbin.info/www/bejne/Zqu5aaF9mqyoobM

[@sigurdbrattland7828]

great work, helped me out a great deal :)

[@RobertDIY]

+Sigurd Brattland Good deal, thanks for watching.

[@CraftAndu]

Well, I am confused! I own a 1995 850 but there is no OBD port under my hood. From the OBD2 port (inside) I can't get any information for some reason.

[@RobertDIY]

Have you checked the fuse?

[@CraftAndu]

@@RobertDIY yes! The computers connect but can't get any info from the engine. We did manage to get info from abs.

[@worldwar6ix]

Hi Robert. I am in dire need of a new obd1 diagnostic unit A box. I purchased my 1994 manual 850 NA amd the wire was missing from the unit A box and can't find one anywhere online. Please let me know if you have one or can get one I can pay asap I am in Canada. Thank you

[@RobertDIY]

I have one. Send me an email.

[@zultan824]

Hi Robert , thanks for your videos I've found out how to fix loads of stuff on my v70xc thanks to your channel. Have you ever encountered an intermittent abs code 0074 hydraulic valves faulty signal? My abs sometimes intermittently kicks in under light braking and I've had the abs and stability light come on randomly for a few seconds after 50mph. I know it's a long shot but could it have anything to do with worn tyres on the front and decent ones on the rear being an all wheel drive?

[@RobertDIY]

kzbin.info/www/bejne/a4nQlqabocSBkLs

[@RobertDIY]

Not sure what year model your car is, however, for most of them, if the AWD system is still installed on the vehicle, it is critical to keep all 4 of the tires the same wear ratio/condition. If you fail to do that, you can destroy the AWD system pretty quick.

[@zultan824]

@@RobertDIY it's a 1999 v70 xc. At first I thought it was just a glitch with cold weather as the lights only stay on a few seconds then go off and only seems to be after 50mph. I put the tyre pressures slightly higher in the front to compensate a bit and last I tried the lights didn't come on but the abs did kick in randomly under light braking. It's booked in to change the tyres soon so will see if it makes any difference but I doubt it

[@zultan824]

Thank you I'll give that a try. Thanks for your help. Love from the UK. 🙂

[@n8trsho]

Such a simple, user-friendly system. Great! Volvo FTW

[@RobertDIY]

n8trsho Yes it is.

[@jamesmacdonald3090]

Hi, my A3 ABS port has thrown up 122, 141, 142, 211, 311 and 322??????

[@RobertDIY]

Interesting

[@JoseSantos092MLBOA]

On Volvo 460 1.8Turbo is the same process?

[@JoseSantos092MLBOA]

My 460 had an ABS error code and I dont no how to clean it

[@RobertDIY]

I have no idea. I've never worked on those.

[@katiemarie2362]

What should i do if it’s not reading any codes?

[@RobertDIY]

Is it working?

[@craigellsworth9682]

I put my 01 Volvo XC70 up on jack jacks to check for a vibration. Ran it up to like 60 mpg. Now the ABS light wants to be serviced. Any idea to fix this ?

[@RobertDIY]

+Craig Ellsworth nope.

[@eugeniakozlowski2061]

Hi Robert, another great video. You are a wealth of information! Thank you so much for sharing it! I'm a single mom of a United States Marine and have limited income. Recently having problems with my ABS brakes engaging on their own while driving at about 25 miles per hour. Any suggestions? The wheel speed sensors were recalled years ago & the dealer replaced them for me. The car has just over 170,000 miles, but I would like to keep it running. Can you please give me suggestions. Is it the ABS module or wheel speed sensors that are bad, need cleaning, all or only bad one need to be replaced? Thank you in advance for your help.

[@RobertDIY]

I don't even know what kind of car you have???

[@eugeniakozlowski2061]

@@RobertDIY I apologize!! I have a 1999 Volvo s70 base model

[@eugeniakozlowski2061]

No warning lights.

[@irenabizjak6107]

Thank you, you've helped us a lot! It worked on the 1996 Volvo 850.

[@RobertDIY]

+Irena Kmetec thanks for watching.

[@gabrielpainter155]

Hi Rob. My son own a 1988 760 volvo turbo and for some reason when you give normal gas it's running perfect ,but when give gas like to pass somebody or an emergency the car loose power inmediately and can get more than 30 miles an hour. Any ideas. We change MAF , plugs, cat, rebuilt injectors, check muffler and nothing. Any sugestions? it is this model intercooler 760 with a 2.3 L OBD1 compatible or something more obsolete. thank you Rob

[@RobertDIY]

gabriel painter Is there a tear or something in one of the intercooler or turbo tubes?

[@EricK-ik6rb]

gabriel painter could have been dirty or semi clogged fuel filter

[@AthensGuitarLessons]

Would the process described here apply to a 1993 940s with turbo? I know it seems like a dumb question, but I'm not very car savvy, and need to be sure before trying this on my vehicle.

[@RobertDIY]

+AthensGuitarLessons Doesn't hurt to try, unless it's a timing belt. lol Yes it should.

[@HaakonElseth]

If I have some trouble with my 850 94 model, I always know where I can find answers

[@RobertDIY]

Thanks for watching.

[@bruno20081969]

Hi Robert...when i put the cable on nº3 and start the ignition on, the light turns on right a away and stays there! Doesn´t let me do nothing!!

[@RobertDIY]

you are not suppose to start the car.

[@bruno20081969]

@@RobertDIY It´s the only way i can read the errors codes. Ignition in position II doesn´t allow me to read nothing! Don´t know why.

[@jonassonbe476]

Hi Robert.When you reset the codes, by pressing 10 and 10 sec with the jumper on the A3 port for instance, do you reset only the codes stored on that port A3, or all the codes in the system??...many thanks

[@RobertDIY]

Only port 3

[@jonassonbe476]

@@RobertDIY thanks Robert

[@johnluchsinger3518]

So are there any other things needing to be done when replacing this ABS module? Our 1997 Volvo 850 has the same thing, though the ABS light will go off, it does come on occasionally. I bought the ABS with socket and will replace it, and wondered if you have to have any other information or software updated after this is reinstalled? Thanks for any help in this area.

[@RobertDIY]

+John Luchsinger what did the video say?

[@krisschirmer-designerartis1933]

WHAT DOES IT MEAN WHEN THE ABS AND TRACKS GOME UP ONCE IN A WHILE? K

[@badmooserestoration9736]

Bless you Robert =]

[@RobertDIY]

thanks

[@PlectrumZProduction]

I noticed you moved the pin from A2 to A3 during the mid last part but than at the end you’re back at A2…. What’s that about ?

[@RobertDIY]

Don't get distracted. Just follow the instructions.

[@PlectrumZProduction]

@@RobertDIY how can i follow the instructions if you tell one thing and show another? If the instructions is the same and I can ignore why the plug was in A3 I’ll try it out 😅 Got a beautiful vine red 850 1996

[@berkdemircakmak5659]

Hi. I have the 1995 volvo 850 t5. I have read the codes 213 and 214 from the A3 (abs) socket in error codes. I am getting error code 113 at entry a7(Combined Instrument). what is this? what is wrong with these codes? and the a6 socket seems empty, why? Thanks

[@RobertDIY]

I don't understand your issues. You may have a bad instrument cluster.

[@generalyamashita4055]

Hi Robert ! Thanks a lot, the CE light is gone. I get a 521 code Front HO2S Preheating (850 2.5L 10v 1994 non turbo). What's next ?

[@RobertDIY]

Replace the sensor...

[@xavierfernandez2657]

is the process to read the codes the same for the B side? I tried and nothing

[@RobertDIY]

yes

[@xavierfernandez2657]

Does the B port have its own cable? If it does cant find it anywhere. @@RobertDIY

[@RobertDIY]

No

[@elliotjonsson9283]

Hi! Great video! I have a problem with my automatic 850 -93 140hps. It only drives in reverse, transmission oil looks good I get fault code 232 in the a1 port. Have tried switching the computer for the transmission without results. Is the best solve to just replace that transmission or is there an easier fix? Thx /Elliot

[@RobertDIY]

I would try the PNP switch.

[@elliotjonsson9283]

@@RobertDIY i read somewhere that you can test the pnp switch by putting it in reverse and if the reverse lights turn on, it should be OK. So I tried this and the lights turn on in R. Could the pnp switch still be the problem? Thx!

[@elliotjonsson9283]

@@RobertDIY Hi again, I changed the pnp switch today. Same problem still, car drives perfectly in R, but doesn't drive at all in any other gear. Do you have any ideas for fix? Maby time to start looking for a new gearbox

[@sjbock]

I think the 232 code in the A1 port means the transmission speed sensor is bad.

[@nicholascambrelen6656]

i have a 95 volvo 850 turbo. just replaced battery and still will not start. any suggestions

[@RobertDIY]

+crystal candyfire kzbin.info/www/bejne/j5qzcoOrYrBrhas

[@DaReaperZ]

What if I use a foxwell code reader? I got the code IMM-211 and IMM-221 I think, any source where I can see what it means?

[@RobertDIY]

DaReaperZ Google should be your friend.

[@lovesalie]

Hi Robert! The jump wire is disconnected from the port (A side) on my car - do you know how to remedy this?

[@RobertDIY]

+Sara Anger you may be able to repair it with solder. I usually replace them.

[@EricK-ik6rb]

Will this method also work for clearing SRS light on a 93 940 after driver airbags been deployed? I am trying to get my seatbelts functioning again after the accident and it would be nice if I could get the SRS light off too.. Would it come off if I swapped an airbag from junk yard?

[@RobertDIY]

e Kbauer If you replace all of the damaged component, yes you can reset the light.

[@RobertDIY]

e Kbauer If you replace all of the damaged component, yes you can reset the light.

[@thewanger]

If I clear the codes will they come back if I dont fix anything? And if so how quickly? Thanks

[@RobertDIY]

Yes. Depends on the problem.

[@thewanger]

@@RobertDIY Thanks!

[@5lwrf3]

I was able to get the codes cleared from the "A" OBD tool. Ran the car for a while back and forth in the driveway and no problems. Now I am really confused and I know I have to take this car out on the road to really test it. This time I will get my wife to follow me in the other car. I guess if it stalls again, it wil throw a code and then I will be sure if it's the MAF sensor or the Cam sensor.

[@RobertDIY]

OK

[@johnnycat1575]

hey robert im having trouble. my red light is automatically on and the button doesnt do anything when i turn my key. what does this mean? its in a1. im checking for a flashing orange arrow problem. it seems the car shifts fine it just has that arrow when i go to drive

[@johnnycat1575]

turns out im also missing the whole connector to a5... there isnt even a wire hanging out anywhere. some of the other ones no light comes on, and/or same thing with A1

[@RobertDIY]

Just check the ignition and transmission ports.

[@johnnycat1575]

@@RobertDIY ok i did that and i get A1 232 and nothing from ignition. my main issue and question is if no speed sensor can cause the flashing arrow and flashing economy light. ive drove around counted shifts dozens of times and it seems to shift perfectly, no sign of this "limp home mode". so is this a good diagnosis of the light? just being from no VSS

[@johnnycat1575]

btw i also got p0500 (no speed sensor) from two different obd2 scan tools.

[@j718wn]

I also tryed to get the serice light to come off no luck I put it in port 7 like you said the light never came on.

[@RobertDIY]

Maybe you need to clean out the ports.

[@gunnar_langemark]

Hi, I've been able to drive these old Volvos for the past 5-6 years thanks in part to Roberts DIY. I have now encountered a problem which I wonder if any of the users here have a solution to: I need to reset the error codes that we see in this video. I reproduce the procedure after reading the codes, but nothing happens. I depress the button, the red light goes on - and stays on for the 10 seconds I depress it. Then I release the button, and the light goes off. But it does not light on again. Ever. I try to depress once more for ten seconds - but it has no effect. The lights on the dashboard is still there and the error codes remain in the system. I wonder what it might be? And I wonder if there's a solution to this problem? Anyone with a suggestion?

[@gunnar_langemark]

It's a 94 850 T5 2.3 liter.

[@RobertDIY]

Have you fixed the problem?

[@gunnar_langemark]

No. I have tried, but I have not been able to see how I can reset the codes without using the method you have deviced in the video. On my previous 850 I could do it. But it doesn't work on this one. I can't keep driving it for more than a few weeks because I need to have it tested by the authorities every two years (here in Denmark) - and certified for road driving. And they will not certify it with the lamp on - even if the car does not pollute more than accepted according to the regulation.

[@gunnar_langemark]

So basically my primary aim is to remove the light on the dashboard. I have changed the lambda unit. My error codes are: A2 - fuel injection: 132: Battery voltage too low (I have a good new battery - can low voltage in some of the system cause the inability to reset codes?) 143: Front knock sensor signal absent or fawlty A3 - ABS 321: LH front wheel sensor intermittent signal at speed over 40 141: Faulty brake pedal position sensor shorted to earth or supply 144: Brake disks overheated (TRACKS code - and I don't have tracks) B2 - Cruise control 122 - no speed signal (I have not gotten around to work on the cruise control). I get no readings from A6 which is the ignition system. Also it "rotates" the error codes as your video shows.

[@grantsmith5919]

Hello Robert: I have replaced a number of parts on my 1994 Volvo 850 wagon (non-turbo) but am looking to replace the ECU/ECM. The car has a 5.1 and 6.2 number on the module as well as the part number. I can find replacements for both modules (with matching part numbers) but cannot find out which modules does what?? The problem is basically that the car starts right away and automatically rev's to 2500 rpm the dies. If I pump it it will (after a time) idle but it is rough. Can you please help to clarify which module I should replace? thanks Grant

[@RobertDIY]

What error codes does it have?

[@grantsmith5919]

@@RobertDIY Hello: The error codes have been cleared by the fellow I have helping me. I believe he said they were emission codes . The check engine light is on.

[@RobertDIY]

If the CEL is on, there are codes in the system. Use the video and get them.

[@grantsmith5919]

@@RobertDIY Thanks you will do

[@shariogletree2430]

I have a 2007 V50 and the air bag light is on, I purchased a scanner but I don't know how to get to the default

[@RobertDIY]

Swing by and I'll walk you through it.

[@amyschaffer2468]

Hi Robert. I did this with my 93 and all went well except for the A3, no light came on at all, ant that’s the main one I was hoping for since my abs light is on, any suggestions?

[@RobertDIY]

Not really. You can disconnect the box/reader and clean off the contacts. If that doesn't work, replace the box.

[@amyschaffer2468]

Robert DIY thanks for all you do, you have helped me with so much!

[@werock0001]

Hey Robert, I replaced the mass air flow sensor on my volvo 850 1994. Check engine light went away on its on after I unplugged the battery and connected it back up. So I Did not have to reset that. However, I feel like the car still seem to run lean because the rpm seems to stay about 850 rpm. It does not run rich because the rpm isnt going above 1000 at idle. Could the idle air control valve be faulty? Does it ever need replacing or is this some other problem?

[@RobertDIY]

Idle is supposed to be 840.

[@werock0001]

Robert DIY is there an email where i can send you a picture of the gauge cluster so that you can eyeball it and tell if it looks like 840 to you? I am having this weird feeling because every time i shift from park to drive/reverse, the rpm fluctuates for a quick second and then becomes constant. Is that normal? Is it possible to diagnose or findout if this weird feeling I am getting is false? Since there is no lights on except ABS/Tracs, which means obd in the car wont give me codes on this cause. So can I check this forsure in any other way?

[@monroe545]

Hey Robert I'm getting a 232 121 113 on a 90 240 I've recently replace the mass air flow sensor and wondering if an o2 sensor may be the issue

[@RobertDIY]

Have you googled the codes?

[@monroe545]

Robert DIY yes sir I got a mass air flow sensor code so I got a new one crank sensor code which I replaced as well as o2 sensor which I just ordered I cleared all the codes but after I ran the car all three codes came back

[@betsyross2365]

my rear passenger power outlet came loose how do I fix it ? this is a 1998 volvo s70.

[@RobertDIY]

+Betsy Ross kzbin.info/www/bejne/f6LWiYqsab9pkLM

[@jamesweems4663]

Thanks for the detailed instructions.

[@RobertDIY]

James Weems Thanks for watching.

[@j718wn]

Hey Rob I have a 1995 Volvo 850 I still can't get the engine light to come off. I tried serval times I did get theses codes 314, 212, 213, 214 out of port 3. I hold the button down like you said once I ran threw the codes still the check engine light is on.

[@RobertDIY]

Maybe you need to fix the problems.

[@j718wn]

Ok thanks. My coworker referred me to a machanic that fixes European cars he's good from what they told me. I'll let you know what happens. Thanks for all the advice. I was a VW guy now I'm down with Volvo.

[@ivantheteribul]

Just a quick question: I ripped the cord off the plug on my OBD1 unit on my '95 Volvo 960. What's the best way to put it back together? Thanks!

[@RobertDIY]

Solider.

[@ivantheteribul]

@@RobertDIY What's the best way to go about doing that, with not much wire to work with?

[@RobertDIY]

Remove it and take it to a bench.

[@nm5O]

Hi Robert, plugged in socket A2 my led is on constantly (with about half power) and codes can not be flashed. Does not react to pressing it for one second (or any other length). Disconnecting the battery or turning injection off/on does not make any difference. All other sockets work fine. Do you have any idea how to check/fix this socket? Volvo 850 T5 94´ Thank you:)

[@RobertDIY]

+volvo850t5 probably a bad box.

[@apb123]

@@RobertDIY Hey Robert I am having same issue. B1 Socket makes LED stay on, does not react to button presses or holds Should I replace the whole OBD1 reader ? Thank you!

[@autumnhiggs4344]

My main issue is the check engine light. I bought my 94 850 in early May, and the tabs expired. Little did I know the cel can not be on or you will not pass your emissions testing in the state of Washington. The car runs like a dream I love it so much, but will this keep the light off just so I can pass my testing, and am able to drive?

[@RobertDIY]

I don't understand your question. Why is the light on?

[@autumnhiggs4344]

Sorry, My question is will resetting the codes turn off the light forever? Or will it turn back on once its driven for a while. My step dad and I have gone through the codes and fixed everything that came back. The main problem was the PCV system. Smoke was coming out of the dipstick.

[@RobertDIY]

LOL, as long as there are no issues the light will stay out. If an issue comes up, it will return.

[@alexdapony]

Hey Robert. My check engine light was on for about 5 days and it turned off yesterday. However, when I start my car the check engine light does not show at all. Should I worry about this?

[@RobertDIY]

Sounds like the bulb burned out.

[@alexdapony]

Robert DIY but why is it only two lights that don't turn on and the rest do?

[@RobertDIY]

Because those are the ones that burned out?

[@alexdapony]

Robert DIY dang alright well thanks Robert I'll head to AutoZone today

[@pekkaturunen5888]

Superthank's!!

[@RobertDIY]

you are welcome.

[@rosadapraiapousada1821]

tks !!! excelent teacher!

[@RobertDIY]

You are welcome.

[@seidoxu]

Hi Robert i live in Sweden, but also have an issue on an Volvo 850 -96 The problem is i can not reset my " engine light " it did work well to reset it with removing a cable from the battery. but that has stopped working, now it impossible to reset it. ive tried several computers, but none of them works :/ so im writing to you to maybe get som trix to fix this ? Ive benen watching ure videos for a long time :) u got good content. keep it going :) cheers

[@RobertDIY]

what code is in the system. fix the problem and you will be able to clear the code.

[@seidoxu]

@@RobertDIY i dont have any tool to check the code as i described

[@jameshopkins9332]

Hello Rob, one question, what if i have no code at all?

[@RobertDIY]

Then the car would be codeless. 🤔

[@mpollux2]

Hi! I drive a 1994 960 Wagon. The diagnostic setup looks identical to the one on this 850, and I'm only getting flashes from port 2, when I insert the little jumper in any other port and hold the button, nothing flashes back.... what could be the problem?

[@RobertDIY]

+Car Wash Studios Probably no codes in the other systems. Do they flash 1-1-1?

[@mpollux2]

+Robert DIY no light at all! and I'm concerned with the car because there's this peculiar tapping noise that happens when I push the gas pedal slightly, let go, and push it again, and it only happens when I'm going 35-50. the oddest thing is that it comes with the front end. My mechanic (who doesn't have much experience with older volvos) is baffled as well..... since you're experienced with volvos, have you ever heard of this? I AM getting some codes from the oxygen sensor but I wouldn't think that would be related..?

[@RobertDIY]

+Car Wash Studios Are you pumping 91+ octane?

[@mpollux2]

+Robert DIY the car was my moms, and she always used 88. now that the car is mine I make sure to use premium grade.

[@RobertDIY]

How about the oil filter? Is it Mann? Maybe a lifter.

[@phneutraal7995]

Why is the plug later suddenly in pos no 3?

[@RobertDIY]

Magic! 😜

[@jonathancano2580]

What happens when your abs light is on how can I check that?

[@RobertDIY]

kzbin.info/www/bejne/naWcqGCQiN2mb6s

[@phneutraal7995]

My '95 850 t5 dienst have this feature , it only has an obd 2 connector underneath the coinholder. I guess i have to go to a garage for resetting my lambda warning light...

[@phneutraal7995]

I mean ,doesnt have....

[@RobertDIY]

Probably a '96.

[@hondaxx100]

i get 4,1,4 and 2,1,2 in my obd a 850 94 mod and when i try to delete,,i hold it in 10 sek first but the light dont shows again??????????????????????????????

[@RobertDIY]

+Rolf sørdal maybe the box is bad.

[@hondaxx100]

+Robert DIY ok,thanks