How To Fix A Misreading Speedometer

How To Correct A Speedometer - Honda S2000 - Speedo Corrector
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Fixing the speedometer on my Honda S2000, which as you can see clearly reads too high. While traveling at a GPS verified speed of about 80 to 81 miles per hour, you can see the car’s speedometer is reading 87 miles per hour, significantly higher than the actual speed. This is a result of changing the final drive gearing in my S2000, but you could also have a speedometer reading incorrectly from putting on different tires or wheel sizes. To correct this, first you need to know how much your speedometer is off by. You want to travel at the highest legal speed you can near you, so that you can have an accurate percentage difference. In my case, driving at about 81 miles per hour shows a speed of 87 mph, so my car is reading about 7.4% high.
Next I’ve purchased a Yellow Box correction kit. These can be used for many different makes and models of vehicles, simply splicing into the speed signal wire, or by using a plug and play kit they provide, also available for many different brands. The first thing we need to do for the install is lift the front of the car up onto jack stands. The speed sensor for the speedometer is on the transmission for the S2000, so we’ll need access to it. Once underneath the car, unplug the sensor from the transmission, and plug in the new harness. There will be plenty of wire length for the Yellow Box to plug in, so at this point I pulled the connector out from under the vehicle to program it. Then plug in the Yellow Box.
Turn your ignition to accessory mode, and you should see some lights flashing on the Yellow Box. Once powered, the box will tell you what the current correction factor is, by flashing the red light. Short flashes represent a count of one each, and long flashes represent zero. In this case we have 1 flash, then four long flashes, meaning 1 0 0 0 0, or 100.00% correction factor.
My S2000 is reading about 7.4% high, so we want a correction factor of 107.40%. To program the box, hold both buttons for about 5 seconds, until both green and red lights flash. Now, by pressing the plus button, the correction factor will go up by 0.1 percent. Pressing the plus button 74 times will give us our 107.4% correction factor. You can also hold the button to speed this up.
After you’ve programmed it, wait for both lights to flash. This informs you the setting has been saved. Turn the car ignition off, and then turn it back on to check that the setting is correct. Once powered, the device automatically reads the current setting to you.
I’m simply choosing to zip-tie the Yellow Box for now, directly beside the transmission housing. The device comes with a 10 year warranty and is weatherproof, heatproof, and vibration proof, but make sure you don’t place it near your exhaust or extreme heat sources. With the device in place, it’s time for a test drive. As you can see the car now reads much closer to the actual speed, and is reading just slightly conservatively high, which I’m fine with. You could choose to fine tune at this point if you prefer.
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[@iSuchtel]

"Highest legal speed near you..." Mate i live in germany.

[@Dealmann]

Wir habens halt gut :D

[@shoaibcasseem647]

no speed limit then

[@EngineeringExplained]

iSuchtel 155 mph it is! 😂

[@ZoMbEeeHD]

damn came too late. was about to write the same joke :/

[@bruderrudiger9574]

Engineering Explained No, it s as fast as you want... in most case

[@F14Goose37]

How to fix a Speedo. Boy was I misled.

[@bmooreskier]

disappointed*

[@averageinvestor4986]

podgehog Its a joke lol

[@treat91]

you're looking for a Cluster not a speedo

[@alliedfederalelectriccorp3469]

u stoopit, lol!

[@69ER509]

Brian C Same. lel

[@ernestocastellanos6446]

Tunes it really low* Yeah, I could 0-60 in 1.15 sec. Watch me.

[@cyrilmatthew2995]

y dont he use white board and formulas

[@Welcometofacsistube]

Cyril Matthew Why doesn't he use a whiteboard and formulas? Amazes me the level of incompetent grammar. Don't you people realize that people perceive your intellect level by your grammar of your posts? Grammar as horrendous as this tells me you don't even have the iq level to tie your own socks GET SMARTER !!!

[@bradyk2600]

Kristopher Klassen I love when people complain about someone's grammar but have grammatical errors in their own comment.

[@cyrilmatthew2995]

ohh yeah ... i dont care what people think about me ... and the so called intellects like you may not have the ability to understand the sense of sentence and boasts about the grammar LOL ...are u shakesphere, wordsworth or keats ... your comment tells me that you dont even have the commonsense of a baby so your IQ is beyond any thing in this reality can expalin ... oh sorry u dont know what common sense is ..ryt???

[@cyrilmatthew2995]

i wasn't insulting the show host ... jst posted a random comment coz i used to see him explaining things with boards and formulas ...

[@cyrilmatthew2995]

tie your socks or shoes, its not people, its you who perceives intellect with the level of grammar that too in an independent and informal platform like this ...

[@screwaccountnames]

What a jank interface.

[@Pspgamer789]

It's cheap, simple and works what more do you want?

[@Pspgamer789]

I meant the design is cheap. The ludicrous price is another argument

[@MrMrsirr]

I don't know why it costs that much, but if it had a GUI it would be far more expensive. Hell at that point seems like it would make more sense to just make a phone app and an adapter for the phone. Actually that seems like a pretty good idea now that I think about it.

[@screwaccountnames]

It doesn't need a GUI. It just needs a 7 element LED that displays a number, instead of some random ass blinking lights.

[@DozIT]

screwaccountnames agreed, but why bother putting time in effort, where in most cases it will be programmed once in its lifetime which takes 5 mins. That being said it should be $40 not $100!

[@M3NACE]

dont do it bro. adds weight bro. racecar bro. bro.

[@salsathe4th]

Chris Fix sure sounds a lot like engineering explained here.....

[@tomtomsmith98]

I thought all cars over-read from the factory intentionally?

[@bomberjuli]

They do! In older cars it can be up to 10%. My unmodified VW golf mk6 overreads about 5-6%.

[@porthos1000000]

@Julian Schmidt I have a mk5 jetta that seems to be the same way lol. Just need to find someone with a VCDS....................

[@MattBlack6]

Tom Smith they do. The factory don't want to be responsible for speeding fines.

[@cesarignjas]

factory does that for a number of reasons: it does give to the driver one unrealistic "feel" that the car is faster, acelleration is better because it hit the target early and also the fuel economy seems to be higher as you cover extra miles for your gallon, legally they can be up to 10 % off to up but not for down, so they do that to be in the safe side

[@Mudux]

They do. People need to take care when adjusting speedometer readings because the odometer will then be wrong.

[@SarahnTuned]

This was so neat, I always wondered how to fix that!

[@DaB3ST_JmFLOW3RS91]

Yup same here 😁

[@BirdiesGoCherp]

Do you intentionally sabotage/alter your car so you can make these tutorials? Because they're really good.

[@TheGreatrix8]

Khaled Hossam nah he bought that S2K used with the intention of fixing all the little things on it to show us how to he. the reason it was off was because he changed his Differential

[@Damage42X]

Khaled Hossam Having a different sized wheels alters the speedometer. That was the case in my car, a Lumina SS if you're from the Middle East.

[@MattBlack6]

Damage42X you won't have to worry about your Lumina SS for too much longer. Holden cease production this year, so you won't be able to replace it. And being a Holden it will soon fall apart.

[@BirdiesGoCherp]

Damage42X cool, never heard of that car. Never seen it before either.

[@Damage42X]

+75mattyd I think it'll get me going for about 5 more years or so. It's an LS1 engine so I can find numerous parts for it.

[@samanderson855]

Every time I fire up an Engineering Explained video, and I hear Jason say "hello everyone and welcome," I truly feel welcome.

[@Nick22051]

so does this mean when I put it to 200% then the speedometer shows only half of the speed. like 50kmh instead of 100kmh. And does this mean the km only counts half? So when I travel 100km my car shows 50km?

[@hardassponge9018]

Hunter178 thus saving fuel?! 😂

[@margauxj-broussel9186]

Hunter178 thus being able to sell the car with less distance on the odometer.

[@porthos1000000]

Yes and no. your speedo will read your modification correctly, but depending on the make and age of the car, the odometer will likely record distance separately so as to prevent scamming the ownership and usage history.

[@Quetzalcoatlv3]

LoL you should came to Poland. In Germany 5 year old BMW would have 150 000 km, but when the same BMW will ride (on tow truck) to Poland then the mileage will 'magically' drop to 40 000 km. We have 17 year old vehicles imported from Germany with the course of 150 000 - 200 000 km :D

[@RWoody1995]

does this mean that if you fit a different ratio differential and adjust the speed this way, since the ecu gets a separate reading the ecu will still be getting the incorrect speed for the odometer and you end up with 7% higher indicated mileage? :o

[@deanrhodenizer938]

Thank you for following through on this. Good idea to use the GPS instead of doing the math on the old and new final drive ratios as that would have caused you to retain any built in OEM based speedometer error. For now you know your speedometer reads just slightly high at 80 MPH - should help you stay out of trouble. Great video, thanks again.

[@erzafluff6121]

I just use the radar gun equipped speed limit sign cuz it tells me my speed when i drive past

[@MicraHakkinen]

That's all well and good, however bear in mind that virtually all speedometers have a built-in deviation. In my car I can read out the speed via OBD-II and it will match up exactly with the GPS (+/- 1 km/h). However the actual display is always reading 10% higher. If I were to fit a yellow box in my car to fix the speedo's deviation, I'd be throwing off the ECU, speed-dependent power steering and most importantly the mileage by 10%. That would for example make me about 13k km / 8k mi late for my timing belt service interval. So personally I'd set this yellow box to only compensate for what's changed (gearing or tire circumference), maintaining the factory default deviation on the speedometer.

[@pwolkowicki]

What to do when a speedometer shows different misreadings depanding on speed? I.e. When I drive 50 km/h according to GPS, my speedometer shows around 56-57km/h, and this 5-7km/h stays the same from 30 to 140km/h, when I reach 160km/h, the measurement is spot on with GPS - straight up to 220km/h(max speed).

[@308_Negra_Arroyo_Lane]

Ouch. Almost 5K rpm while cruising.

[@MagicDartProductions]

With how high the s2k's red line is that's normal. 5k is about 55% of his red line so in a normal car with a red line of about 6.5k it would be like cruising at about 3.6k rpm. That and his final drive gearing is much more aggressive than normal.

[@SayMoreTaimoor]

MagicDartProductions I think he means ouch to the fuel economy lol. At 80 mph in 6th gear in my unmodified S2000, I'm like at 4,000 RPMs already. While compared to the redline, that isn't that bad like you said, but fuel economy still kind of sucks regardless. Not that I bought an S2000 for fuel economy, but... You get my point lol.

[@rkelypnonu9423]

yeah well there's a reason why it averages 20 mpg. After driving last night I felt like I wasted money. Only time I manage to keep the rpm low is by quickly shifting to 6th but idk how good that is for the car cruising in 6th at a meager 35 mpg :/

[@SayMoreTaimoor]

R Kely P N on U Lol maybe not that good for the car or fuel economy. Also, I've read that I'm not supposed to skip shift... which is interesting. Super fun car nonetheless.

[@melody3741]

Walter Black i drove in my dads miata to florida at about 4.5-5k all the way there. i got about 28 mpg.

[@Hollowseed1]

You'll fine that most modern cars read at between 5% to 10% higher than actual, usually around 7% , (at least I know this to be true of Jap cars). Just got a 2008 Nissan Skyline 370GT and it's stock and reads just over 7% higher.. The 2000 Nissan Gloria Y34 I had before this read 5.7% higher than actual also..

[@hondaposted922]

Ignore it...As most of you know the whole planet is becoming a NANNY state. So if every car on the road had a speedo reading lets say at 100k's and the real speed being done is 95 all the cars would be running down the Highway at 95 so no one thinks any different. My 2016 Toyota Hilux Trayback reads 120K at 110 on the 3 GPS's I have put in it. My last car got to go down to Victoria and in 2 places on the main highway, there are overhead speed radars that let you know your speed as you go under them. So I asked a Police Officer that was managing a radar trap if he could check my speed well the GPS was right. So it is a standard thing with cars in the last 10 years that they run off the factory floor with a speedo that reads faster than the real speed. TRY for yourself get a few folk together and set up a bunch of GPS and go for a drive in everyone's car --- you all just may get a shock.

[@westcoast2797]

Why did it read faster then actually I have a truck with 35s an it reads 10 above in city an 20 above on highway speeds an once the tack read 100 I've hit 80 an the governor won't let me pass but I'm confused I thought big tires make you go faster then the speedometer says?

[@qwesx]

The more you know: It is illegal in Germany for a speedometer to display too low speed, but it *is* allowed for it to show up to 10 % (+ an additional 4 km/h) too much so that in the worst case you're never driving too fast. So "correcting" it down might actually be illegal if you overdo it as tire pressure on warmer/colder days can invalidate your measurement. My car can supposedly only do 183 km/h, but I easily got it to "200" ;-)

[@TomHo147]

can't you calculate the theoretical difference using the new gear ratio?

[@danieljensen2626]

Tom Ho I'm surprised he didn't do that actually, but it was probably off a bit even before he changed the gearing.

[@danieljensen2626]

Custom Coin Rings USA Yeah, but he's always calculating theoretical values for stuff on this channel, I'm honestly surprised he didn't include a calculation just to see how close it would be.

[@sijankhan7796]

The threads on your tires make up to 3% variability in the speedometer measurement, depending on whether your tires are worn out or not. You can account for all the things that impact the speedometer theoretically but it just doesn't make sense.

[@nathan00campbell]

all these companies are out of hand. just find out the pulse per mile rate of your oem speedo, and get a gps controller to match for much less than any of these extremely overpriced speedo calibration tools or dealer cost. its a shame that people allow crooks like this to seriously over charge for such a simple product. also if you convert to a gps signal you never need to calibrate no matter what tire or gear you run again. BUY ONCE CRY ONCE.

[@ArtofHunter]

Like the video but at the $100 price point it's pretty close to what the dealership charges to calibrate your speedo as well and flashing it is a better solution than having another piece connected.

[@thegamepz]

Hello. You will have problems with molex conector after few rainy daiys. Its just not made for out door use. Try to seal the conector and protect it from water, watter salt etc.

[@bilderberggroupinfo]

for others who want to get more out of their governed car... this will effectively remove the governor if you fudge the speed to read too low.

[@69ER509]

bilderberggroupinfo Genius! And just use a Speedo in your phone or summ.

[@bilderberggroupinfo]

exactly

[@melody3741]

bilderberggroupinfo what is a governor? do any cars come factory with this?

[@animefreak5757]

a handful of car's, and most powerful sportbikes have programmed top speeds. Some of these vehicles are capable of higher speeds, but the computer "governs" their top speed to something lower. If your speedo read's low, the governer will think your going slower then you are, letting you reach higher top speeds. Generally this doesn't mean much to most people, because sportbikes being limited to 300 km\h (186mph for you muricans!) really doesn't impact most riders of such bikes or car's with similar limits. the only time you see much removal of governers is with scooters, specifically the ones that are supposed to be limited to 60km\h and don't require a motorcycle license.

[@lilsammywasapunkrock]

i just clip the green wire. or at least thats what i did on all my work trucks with either 55mph or 65mph speed governors.

[@morior3027]

Can't you calibrate it via obd? Will I lose the setttings if I do that? I have a VW jetta mk4.

[@fuckyoutube647]

its ~$120 for the yellow box, about ~$500 for the whole kit. lmfao, yeah no thanks.

[@EngineeringExplained]

The VBOX isn't really made for this kind of thing, but it's super accurate which is why I used it. You just need to be able to know your actual speed. Could use your phone just as easily.

[@melody3741]

Engineering Explained what is it made for then?

[@Patrick94GSR]

what "kit"? It's $93 for the splice harness, and $110 for the plug n play harness version.

[@fuckyoutube647]

The VBOX with GPS antenna. Try clicking on both links next time.

[@Patrick94GSR]

I had already looked at both products. They're separate products, each being used independently of the other. Even though the VBOX is probably what's being used to check speed via GPS, I'm sure there are phone apps that will do the same thing using the phone's own GPS antenna. Honestly with all the tech inside phones today, I don't know why the VBOX unit is even needed.

[@reecemartin453]

as far as i care, if the speedo reads higher than the actual speed its good. that means i am not going to get a fine in the mail 3 weeks later saying i have been caught being naughty

[@supraphonic88]

Curious how this impacts the odometer. I'm always paranoid that with my car's speedometer reading high that the odometer is reading artificially high too. Makes a big difference for somebody leasing that needs to stick to a mileage cap.

[@Engineer9736]

That concern was popping up in my mind as well. I personally don't mind the odometer going up faster, but maybe the government sees it as tampering if they find out during the yearly checkup. If someone sets the correction to 1% then the odo meter wouldn't turn anymore (Extreme example).

[@sevens1076]

What about a GPS analog powered speedometer that you put over your current speedometer.

[@thrasherjoshua]

I prefer the plug into the OBD2 port and change the setting in the computer method. Might be worth a call to your local automotive shop as many of the common Snap On scan tools can make adjustments for tire size in the computer. Depends on the vehicle though. I know the Chrysler OE scan tool also has a similar adjustment capability.

[@bradcogan8588]

What about for older cars that use a cable?

[@WooferCooker]

Brad Cogan Has to have at least OBDII

[@bobsizemore9774]

You change the gear that drives the cable. Different tooth counts change how the speedometer reads. This whole procedure is entirely unnecessary though. This can be done for free if you know the steps to take. Newer cars can be changed with an OBD2 tool. Older cars with electrically driven speedometers will have a procedure such as grounding a test pin, and cycling the ignition key, then adjusting the calibration using the odometer select and reset buttons.

[@baberfaraz4408]

What about old cars with manual things like speedometer cable?

[@DaB3ST_JmFLOW3RS91]

Whaaaat... so when I go 70 I'm actually doing 65......

[@samhicks97]

Copper: Do you know how fast you were going? Perp: Uh i don't know officer my speedo was reading 0 at all times. TBH my speedo in my car isn't working right now... XD

[@notreal5299]

u are laughing but im here reading comments and researching about fixing my faulty speedometer after getting a speeding ticket this week. i thought i was going barely over the limit but the cop says he clocked me going 15 over. he gave me my first ever ticket . i thought he was bs-ing me till i checked my speed against a gps. he was right.

[@Toastmaster_5000]

simpler than I was expecting. I've considered the idea of getting larger diameter tires, for better ground clearance and for reduced highway RPM so this could make that an option

[@HAL-dm1eh]

1:27 I was like "what?? I didn't put anything in the microwave!" And yea I'd be comfortable with the setting reading a little higher than I was going. Learned that from experience. "It must be the larger diameter tires I put on my car, officer!" is apparently no longer an acceptable excuse. :-)

[@gilesk]

open connectors on the underside of a car is not a very good idea

[@neilbaldacchino3524]

How are you sure that the gps is the one that's correct?

[@tamiyadriverGp]

3:33 - Reflection in the iPhone? OK! And what about that airplane in the mirror?!

[@TonyisToking]

GoroPohy 911 bro

[@joyceschreffler4508]

will that work if you're speedometer is where if the needle is reading 60mph but you're really going slower

[@andresalbarran5653]

What if my car speedometer is by cable?

[@Matthew-oj2mq]

Ricers probably mess up the speedo on purpose

[@DjDestinyChicago]

Mine reads double in an E53 X5... it’s putting double the miles on it too

[@LeifNelandDk]

My Renault Twingo is showing 5% too much, but the odometer is spot on, so the speedometer is deliberately lying to me. So if I correct the speedometer, the odometer is wrong. Our next car has a camera reading the signs, and alerts when "speeding"; however the reading is high. That's why we have queues and dangerous overtakings on roads where drivers think they drive the speed limit, but actually are up to 10% under.

[@date_vape]

All I did was match my cars speed with another car that has a reliable speedometer, then I used sharpie to write in new guidelines for the velocity on the faulty speedometer :D

[@SawyerKnight]

...unless you have an analog speedo cable

[@nullplan01]

Actually, I have a different problem: My speedometer seems to be bang on up until about 70 kph, but starts to deviate if I exceed that, until it displays 160 kph but my GPS says 150. So it's not just a relative error, or else I would see about 5 kph difference at 70, not the exact match I'm actually seeing. Tips?

[@Damage42X]

Oh thank God someone made a video about this. I was looking all over the internet for an easy fix but all I found was tuning and other expensive solutions. Thank you so much for bringing this product to my attention.

[@Sman16]

so I'm going to have to press that button around 300 times to fix my Datsun XD

[@u9Nails]

I wonder if that works for motorcycles? They're famously incorrect.

[@u9Nails]

I wonder if that works for motorcycles? They're famously incorrect.

[@LiamSpinella]

is there any way to do this if your car has a mechanical speedo drive

[@peterjford]

I'll stick with swapping speedo gears in the tailcone of the transfer case on my Jeep.

[@oscarcd5]

Last

[@phantommedia9964]

first reply

[@boomstick900]

I tried that once when I was actually first on a video. People just started saying "next to last" "3rd to last" etc.

[@oscarcd5]

boomstick900 I was first reply too

[@firsh]

Is the GPS the most accurate form, should I believe what that says over what my dashboard says, at all times (except in tunnels)?

[@rarbiart]

Such simple kits doe not help in the non-linear misreadings which are in many GM cars. And you may adjust the linear misreading by the OBD interface. it's something like "tire diametre" with several digits. But then you still have the "2nd offset" kicking in at about 40mph, and then the 2nd additional factor kicking in at about 70mh, redering everything before completly useless. I had the 30mph "spot on", but on 130mph was still reading 155... FSCK!

[@JoeSibCars]

My Speedo over reads by 10% when I'm doing 70 MPH My Speedo reads 77 MPH. And I have no Speed sensor on the Gearbox my speed is from the ABS So How would this kit work on a Car where the speed is taken from the ABS Sensors

[@EyeShotFirst]

I kinda like that my truck reads nearly 10mph higher, I've yet to get a speeding ticket in it.

[@mattlastnamehere6403]

I often wondered if there was a way/device to correct this. Awesome! I'm really enjoying your channel, it's a perfect blend of education and entertainment. And helpful tidbits of info like this are GREAT

[@majorphysics3669]

THIS is the reason people go so slow in my area... wait, am I going too fast? Uh oh...

[@quikstang2]

I was expecting some whiteboard calculations to show the math behind the changes the tires and differential caused, or maybe an ECU tune. No explanation of the circuitry or how the components work either (probably mostly a microchip, so the logic in it). At least wear a Speedo (preferably over your pants) if you're going to do this type of video with extreme click bait links.

[@Yisethbrendlinger]

I actually got my Driver's License denied because my mini cooper was showing a higher speed. I tried to explain this to the DMV guy. He said fix it or find other car :/

[@dominicksorrento108]

what if your car has a machanical speedometer

[@Engineer9736]

Finally a video that goes straight to the point and gives an easy fix. Other videos start rambling nonsense for 4 minutes at grandpa speed 🙄. Now got to go find such yellow box specific for my car 😀. Edit: i see the yellow box is 100$. I guess I'll just remember the offset which is free. Edit2: I just ordered a GPS speedo for 20$ from Ali, stick that on the dash, job done🙂

[@MidnightMustang]

Isn't there a way to do it through a tuning device? It had to do with finding the diameter of your... drive wheels? Idk, something like that, and programing it into a tuner of some sort and it'll do its thing through the OBD II port. Is this to fine tune it?

[@Imaboss8ball]

why not use an Arduino to make a GPS/accelerometer based speed sensor.

[@blago6]

how about speedo cable

[@Gustavo-mt4jm]

Yo, my stock Honda Civic also reads roughly 6% above the real speed. Maybe hondas are bad at doing math

[@gagehowell3566]

sorry I can't find these electric wires for my speedometer on my 70's pickup :P

[@Jhardy64]

German cars are like apple products, they break and you buy a new one 😂😂 Jk don't get butt hurt

[@DamirUlovec]

Any clues wnat to do if speedometer from OBD2 (with torque app) reads 60 (mph, km/h) and onboard computer shows 64? I don't mean GPS speed, though. BTW, I have factory recommended tires on my automobile. Also, cruise control is on, so no errors there, driving on a flat surface, no wind, etc. Please advice.

[@ugoleftillgorite]

Is your sensor driven off of a gear? In the case of my Jeep, I just had to switch out the gear size for about $10.

[@FINtr0ll99]

But what if my speedometer ALWAYS shows 10 km/h higher? When I'm stopped, it still says that I'm going 10 km/h... Is this easy/possible to fix? It's still easy to know how fast I'm going, but I would like to actually get a correct reading.

[@shadowrider-xg7vs]

I Got the RKV 125 C version of this bike .. everything about the bike is fantastic except the speedo faster you go the less acurate it is start at around 1mph out but at 40 the speedo reads 45 and at around 62mph it says 71 mph .

[@trogers2120]

well I'm in a predicament.... My analog speedo reads 100kmph, the digital speedo reads 96kmph (yes there is both an analog speedo and a digital one that I can scroll through to on the dash) and my phone's gps speedo then reads ~90kmph...... wtf do I do, is the analog signal from the transmission, and the digital signal from the abs system I'm assuming? Tires are factory size but the front tires are worn and the rear tires are brand new, could that have something to do with the different readings on the analog and digital readings? pls help, thought I have been doing 120 on the dot on highways but I've really been doing like 110 and when im going 130 im really going like 123kmph....

[@jpd76]

HAHAHAHA....Changing things makes a Honda speedometer wrong? Just by buying one the speedometer is wrong. My first Civic was 9% high, and the 2nd hand one of the next MY that I bought for my teenager is 8% high, with zero modification.

[@terryroberts3508]

I have a 1988 Ford Ranger, and it's off a little with the right speed. Say for instance that I'm going 55 mph, and on my smart phone it says that I'm going 50 mph. So that's is 5 mph, slower than what's reading on my truck. How can I go about fixing this, on my Ranger

[@TheLegend-pi4yj]

Lets say the speedometer reads 40mph but im really going maybe 35 or 36mph

[@Clean-N-ShineInDfw]

Hi! Was your speedometer falling up and down as well? I took it to the shop and the guy connected it to my vehicle as I'm driving it. He said my speed wasn't matching his tablet scan that was connected to my vehicle to read what was wrong with my vehicle. They replaced the sensors on my transmission.but my idle still drops as I'm driving. Do you know if I could use a yellow box to fix the issue?

[@SmartMass]

Does having a misreading speedometer also mean your odometer would be inaccurate by a similar %?

[@9bcustoms347]

I'm alittle lost here .... my 05 Lexus LS430 reads 4mph less .... so 60mph reads 56mph on speedo Can this yellow box sort this out Thanks

[@MrFlounder878]

Staring at one's reflection, (especially when driving), could end tragically. Just look up Narcissus.

[@paulnormanreomero5265]

I have 2017 2.2 ford ranger wildtrak. I changed my stoch tires 165/65 r18 to 175/55 r20. How will i know the difference percentage of actual speed? And how can i adjust it?

[@WCGwkf]

mine reads 3 mph high and I'm fine with that. I pretend it's accurate and I'm sure it will save my ass

[@АндрейМихайлов-о6я3ц]

1) my speedometer shows 65 at real 60 km/h and 104 at real 100 km/h, so it's non-linear error, no way to correct by yellow box. 2) how about mismatch between speedometer reading from gearbox and speed signals from ABS sensors? can it lead to strange effects?

[@chriss4365]

mine stays at about 12mph if i tap the plastic it will go to 0 as soon as i turn on the power it goes back up to about 12 mph what the heck is going on?

[@TheCoBBus]

how does it effect lower speeds? my speedo shows +/- 2kmh up to 60kmh but at 120 gps speed I have the speedo at 130kmh

[@SuperAWaC]

gps is less accurate the faster you're going, because it's interpolating your speed. that's why it's not safe to use gps as a speedometer

[@werdwerdus]

SuperAWaC this is true for traveling around curves but a straight line will still be accurate

[@Tryhardninjaas]

Sounds bueno, I was thinking about changing the gearing on my cbr600rr for more torque (probably not for a while though)

[@porthos1000000]

I doubt this would work on my Volkswagen. Aside from having a proprietary hardware and software setup, the incorrect offset of my speedometer readings appear to vary based on the current velocity of my jetta. Sometimes it's close to 5%, and other times it's not. I dunno

[@TheShadowSplicer]

My 2006 VW GTI reads 10% fast intentionally. Would this "fix" end up throwing off my MPG estimate, or my speedometer? Not a lot of info on their website.

[@UltimateRareAncientGearGolem]

Yeah, mine truck is not off by a percentage, it is off by 15 mph at 35, 55, and 75, so I don't know what is up with it, at really low speeds it's correct, but at around 20 it shoots up. It does have an injector out, so it's only got 7 cylinders at the moment.

[@speakingdreams]

Have you tried multiple speedometer apps, and if so, which one do you prefer?

[@arievianza]

My motorcycle speedo shows zero kph again yesterday. It happened once previously and back to normal for about a week before it back showing zero. Any idea where/what should I check? thanks

[@Saulatis]

How to remove speed limiter on Mercedes Benz Actros 2640 6x2 hook lift?

[@Jedirocksalways]

Easy DIY method 1-Open the glass cover 2-move the needle with your finger 3-close the glass cover 4-this was sarcastic dont bash me

[@MrGarcon98]

this maybe my lucky day ? i have a VDO electronic speedometer with a hall effect sensor on a vw buggy, this is my second one from VDO , what happens very shortly or about 20k miles of use the pointer becomes eratic and does not stay on a even speed driving me nuts. i know ii need to check the inside of the hall effect but why are they f ailing so quick ? they are not cheap to buy at all . I wonder how much help ill get from vdo or international comp ? thanks for your vid nice

[@oatmealtheecat8188]

I dit it wrong.... Now my 2005 kia sedona v6 is permanently doing 663763763763763763667376376367 mph...

[@B4CMARO]

500 dollars!? Bah just use a Nav on your phone and set it to show speed. Figure out the difference. Almost free. Or buy a digital speedometer gauge from autometer.

[@Engineer9736]

I bet one could do such fix with a cheap Raspberry Pi or Arduino. It are just I/O signals. Connect the transmission sensor to one of the I/O pins of the Arduino, code something to interpret the signal to a number, apply correction, then convert the corrected value to digital again on another I/O pin on which you connect the original wire which goes to the car's computer. Best way to start out is by hooking up an oscilloscope to the original situation so you can see all the voltages and timings.