ABS Wheel Speed Sensor Fault - How to Test and Fix ABS Sensor 

Hi Tim. Thank you very much for this video. I wasn't sure where and how to test the circuit but now I do so thank you. I have been having a C0040 fault code on my Astra now since I did renovations to it after a failed MOT. Both front left and right sides have had new brake lines and new hubs, with a new clutch kit installed, all bled and pressurised with zero drop in pressure, which I was told is a sign there is a leak or, the ABS pump is kaput. When I powered everything up again (car was without power for about 9 months) I allowed the system to regulate itself for about 15 minutes after being cold for so long. As soon as she started up first crank, the ABS light stayed on. I plugged in my op-com and it showed this code - Front Right Wheel Speed Sensor Malfunction. So far, I have had the whole lot off again and put the old hub back on which was still working, and I was able to clear the code, but then returned. Thinking it was a faulty speed sensor cable, I replaced that which went on this morning. I put the new hob back on and the DTC database stayed free of any codes. I thought it had done the trick, until I started driving and then the ABS light came on, same code. The left side has no problem whatsoever. When I check for continuity between the Neg of the battery to the speed sensor, because it is an integrated hub, I'll need to test from the speed sensor cable instead right? If I get no reading from any of the interconnecting plug sections, can I deduce that there is a fault with the module itself? Thanks in advance

I think this is now best youtube channel i learn this days new things. You have very good animation with multimeter simple and easy to understand.

Great informative video, great job

your video editor needs a massive pat on the back. This is great content

Very good and understandable video thank you !

*Will the vcs abs system in a 04 Lexus gs300 cause my rear end to go berserk when I'm at highway speeds at about 60mph? Even after EVERY SUSPENSION part has been replaced and aligned???*

Hey i have 2010 Vauxhall Insignia with a known ABS fault code of C0040 - 0F (front right abs sensor signal) but i have no access to live data at this time. The code has come back (erratic signal), i have replaced the abs sensor as it was cheap and hoping for a quick fix but no luck, this model doesn't seem to have a reluctor ring and appears to be built into the bearing housing, as its come up as erratic is it likely to the magnet in the bearing housing at fault? It is pretty corroded underneath. Thanks

Great video 👏

Definitely subscribed

Good video. Could go further with passive & active sensors, & showing examples of damaged reluctor/magnetic rings

What happens if Any of sensor got failed ? Is there any other safety function will be available or some else in CAR ?

I’m stumped! My code reader indicates F/R open circuit. The wire has 12v and the sensor reads 5 ohms. I switched sensors but still have the same code. What else can I check? Thanks!

Hi I’m not getting any fault codes but the 3 lights are on e46 bmw cabrio

Hi i hope you are doing well I have run flat inductor tyre pressure check light symbol it's Mercedes-Benz do you think ABS speed sensor can causes tyre pressure check light, it's always on after few miles driving

Hmmmm ! nice vid, and so to a question ( been to the garage for a diagnostic of course but ? ) the garage say there is no information going to the Stability control unit from the main brain or visa versa so therefore it's not possible to say which sensor is playing up and it points to a faulty box of tricks ( this bening the box with all the brake pipes coming out just next to the round pin diagnostic plugin also the engine management light has now decided to join in the fun and the car is poor to pull away but after that it whizzes along real nice . This is a 1999 523i automatic petrol and I know it's old but it is a superb car and it could get financially written off just because of this ( so i am told by BMW ) , what a shame for such a lovely car ( any ideas ? ) Thanks folks

Hi Tim, Thanks a lot for the useful information, I have toyota rav4 2018 and the abs alarm mostly ON (not always). The car previously has a damage collision on the front right side, do the think the sensor or the wire sensor or the driving wheel component damaged and that's why the abs and traction control alarms on? Thanks a lot...

Do you have books for reading about car maintenance?

Is there anytime a bad speed sensor will not light up on dash?

You guys are gonna make some good bussines during upcoming financial crisis. It would soon be a problem to get those oem new parts for a reasonable price and it is soon going to get a lot worse. Anyway a rebuild part can hold as long as a new one if done correctly if I'm not wrong. It is almost the same for turbo chargers, some people can rebuild those to hold even longer then factory original. Cheers

hi mr. ...Nice to meet you , please help me, this resoult my obd scanner , U0401,U0423,C0002,C0001, what problem in my ford fiesta 2011 1,6 ABS , thank u

I have an 08 ford explorer with wheel speed sensor fault and abs pump and module failure. I replaced the wheel bearing assembly and ABS sensor harness with no success. The car beeps at me for 30 seconds every 4 mins. Its absolutely the most annoying thing ever. The car drives with traction control off which is super dangerous. I live in puerto rico and the ford mechanics are supposedly out like 2 years in the service department that deals with electrical problems. The cost of repairs if they did however fix it would be the price I paid for the car. I feel like im SOL. Any advice for fixing it myself or what route I can take in getting it fixed?

Nice

Hi, I have had wheel sensor issues on my leon for about 6 years now. Basically, I have one replaced every year, then another one breaks, then that gets replaced and another one breaks. Would you suggest that this maybe an abs module issue instead of a wheel sensor issue?

Good

Hi what software do you use? It's difficult to find out if they will give you live graph data for the wheel speed sensor before buying. Any advice gratefully received! Low cost would be preferable!

What about when there's no abs pump voltage and no inlet or outlet wheel valve activity and no codes? Calipers dragging intermittently. I wish mine would throw a code

This video has helped me a lot, i have been trying to solve the dreaded peugeot wheel sensor issue for a long time. But i would add to your video, that on my car the enfine needs to be running, and rhe abs sensor neesd to be plugged in or it won't output a voltage. How do i measure it then? I got round this by making a pair of jumper cables between the sensor male and female plugs. I stripped the centre of the wire so i could attach a multimeter. I checked a known good corner and there it was 12.5V. At last we're getting somewhere. Still a way to go.

SO I drove my car and the lights came on for ABS and Traction Control, then by the time I got home they went back off, will a reader find that code or does the light have to be one? I have a cheap OBD2 reader but I do not think it reads ABS, what brand should I get? Thanks I am in the states.

I have e320 2003 with abs light on & my car breaks fine & all but my warning light comes on

Great how to vids! Sorry for the long post. I'm having an issue with my 2008 Nissan X Trail T31 and wondering if you might have a idea where to look. We replaced the broken clock spring after a considerable period of time and after having the steering recalibrated, the abs would kick in at random times while driving. The warning light of the car with squiggly lines under it would flash in sync with the braking of the car. We engaged the 'esp off' button to stop the esp kicking in. We had it looked at and there were no codes showing up on the diagnostic tool. All wheel sensors showed that they were working as you described in your video. The brake system was checked and flushed with no change to the problem. After a few more visits to the Nissan mechanic, it was suggested that it may be the abs module. We are looking to sell the vehicle in the near future (another child on the way), and due to the fact that they weren't 100% on the module being the issue, we sourced another abs module (same number), from another xtrail of the same year and model, instead of a new unit. We were assured by the supplier that it would be compatible. With the 'new' one installed, there were issues with the 4wd light staying on, the abs and esp light coming on and even the speedo dropping out. They cleared up themselves, however we are back to the same symptoms as before with the stability control kicking in unless the esp is disabled. Do you have any advice on what is likely to be the issue? Apologies again for the long comment.

Congratulations first of all for the splendid explanation, I wanted to take advantage of this video to ask a question, I have a problem with my car automatic transmission, I arrive in 4 and it goes into neutral, from the diagnosis it gives me error code U0101 in the ABS / EBCM / ESC module what can it be? Thanks I wanted to clarify that it does so as soon as I arrive at 50 km / h

Hello. Your videos are very good. My peugeot 307 xli 2006 after 10 to 15 minutes of driving brakes and ABS failure is activated. Odometer, speedometer and electrohydraulic steering stop working. After turning off and letting a few hours go by it works fine again. I have checked Alternator and I have cleaned the sensors. What should I check? thanks

Please which OBD scanner is best for both diesel gasoline and electric vehicles

Hello please my mercedes w204 shows this fault code 5001 cc52 what is supposed to be? A failure of abs module? Have i change it completely? Please i need uour help in addition to this the steering wheel becomes rigid when i roll over 20km/h

Hi my Ford Galaxy 2016 ABS sensor is showing a fault again within 1 year of replacement. I can’t understand why this is happening. We used a new genuine Ford part. Thanks

Good Video, QQ, I have a Audi A6 Avant (2014), if both my FR and FL speed sensors are faulty (not completely broken), would my brakes fail, and would stop the car? I was driving the car the other day and the I pressed the brakes and nothing happened. I kept pressing the brake petal then the brakes worked. Audi claim its the speed sensor fault caused it. Seems strange.

Good morning..hope you're well. So to add tht if I've corrosion in ECU connector pins; could tht be a reason for fault code finding no reading. Id assume so... There's no indication of damaged ECU I believe > No issues with sensors nor the castellated ring detected! No speedometer reading. Ty

hi, I changed the new abs speed sensor rear left and it tells me like this (open circuit/short circuit to b+) and I deleted the error code with a cheap obd2 from amazon, you must have a certain larger more sophisticated obd2 with more functions to delete the ECU from the car computer, thank you, I'm waiting for an answer

Hey guys so ive been fighting my car this past week bout 1000 bucks in already. Ive fixed all my problems besides one. i have not had one warning light come on my dash so its kinda scary and confusing for me that my cars not displaying any warnings. Had Autozone scan it and they did tell me one of my abs sensor on the rear of my 2015 accord lx is bad. would that cause my rpms to jump up when letting off the gas? Or is that the transmission sensor any help guys id really appreciate it trynna make it to work monday no mechanics are openend till monday so im kinda screwed i either gotta miss work which isnt really an option right now or i gotta fix this over the weekend. Anyways thanks guys super frustrated right now ive done so much this past week to this thing and its just been one problem after another.

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if only i had the top notch scanner that tells you step by step

Where do you get the scan software

Volvo xc90 both front sensors failed within 15000 miles , although 5 year old car , oddly both went after brief heavy ish braking on different occasions , Volvo dealer answer new wiring harness and sensor £664 a time

My ABS sensor light comes on for like 2 mins and then goes off. How can I test it when the fault is not presented on screen. I am unable to diagnose which ABS sensor is playing up. Any help please?

What if i get the esp lights randomly, even if i just start the car and im not even in it. But i never get the abs light.

My ABS light stay on and the car at times won't start and sometimes it will clean the wheel gears it was better for a short time now it start and don't start.

I have a pug 207 and my head hurts!!

Dirty sensor easy fix is also a thing.

Guy this guy he looks like he has a computer science degree

Do

Surely only active sensors provide a 12v voltage for hall effect sensors to feedback data? Passive sensors have little or no voltage supply and use reluctance ring and sensor induction to generate a very small AC wave from for abs actuator