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Old 02-20-2017, 03:59 PM   #1
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ABS lights and wheel speed sensor issues, Need Advice

Looking for some experience or advice.

I'm having some problems and I'm trying to get an actual diagnosis and take care of it myself if possible. My ABS dash lights and traction control are on because of wheel speed sensor faults. The lights were on for about a week before I changed out my pads and rotors about a month ago (they work great). I just bought a bluetooth OBDII scanner and have used FORSCAN to help me some with this. At first it was just the right rear wheel speed sensor giving an error. I tried to replace it this weekend but had the wrong replacement part (black sensor instead of grey one with parking assist). Before I tried, the replacement the code said "mechanical failure" and then when trying the new wrong part it said "incorrect component" (at least it's talking to the sensor!). Now when I put the old part back on it still says "C003A:4A-2B = incorrect component" (maybe it's fried and can't talk anymore) - and to add insult to injury, 100 miles into a trip today, the left sensor started saying "C0037:4A-2B = incorrect component" (I pulled over and checked the code). Well, that's basically impossible because I never touched the left one. After getting home, I pulled out the battery box (huge PITA) to access the hydraulic control unit and ABS control unit (they're one unit together really) and made sure the connections are secure. I have a correct right wheel speed sensor on the way and if that clears the code for that one I guess I'm buying one for the left too. It's pretty weird to me for both to just go out like that.

I'm not too inclined to get a diagnostic at the dealership for them to charge me $90 just to read the codes and tell me I need new wheel sensors. Can anyone offer any thoughts or similar experiences?


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Old 02-22-2017, 12:24 PM   #2
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Try buying two new sensors. See if the codes go away. This is the only suggestion, and what the dealer would do.
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Old 02-22-2017, 12:36 PM   #3
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as a quicky.. when my sister gave me her jag it had ABS fault lights with speed sensors.. mechanics said it was $900 in repairs i simply just jacked the car pulled the wheels and checked the connectors.. on this jag the rears have an intermediate extention (yes the sensor plugs were short so they used an extention cable) after reconnecting 3 i checked the last wheel which was the rear driver and i found the plug a bit odd it looked fully plugged in it LOOKED like the lock was engaged and i gave it a push it moved about 2mm then a click.. i threw the wheel back on torqued them all and took it for a spin and it went away..

also i found out the abs light came on a few days after they had all the rotors and pads replaced aswell..

if that doesnt work pull the sensors out and while using a clean rag wipe off dirt from the pickups and reinstall

some cheap pads are semi metallic and the dust will cause havoc on some sensors as they are magnetic...even the fine wearing of the rotors give off metallic dust.

if none of those fix it then its time for new sensors.
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Old 02-22-2017, 04:30 PM   #4
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Quote:
Originally Posted by ArcticMynx View Post
as a quicky.. when my sister gave me her jag it had ABS fault lights with speed sensors.. mechanics said it was $900 in repairs i simply just jacked the car pulled the wheels and checked the connectors.. on this jag the rears have an intermediate extention (yes the sensor plugs were short so they used an extention cable) after reconnecting 3 i checked the last wheel which was the rear driver and i found the plug a bit odd it looked fully plugged in it LOOKED like the lock was engaged and i gave it a push it moved about 2mm then a click.. i threw the wheel back on torqued them all and took it for a spin and it went away..

also i found out the abs light came on a few days after they had all the rotors and pads replaced aswell..

if that doesnt work pull the sensors out and while using a clean rag wipe off dirt from the pickups and reinstall

some cheap pads are semi metallic and the dust will cause havoc on some sensors as they are magnetic...even the fine wearing of the rotors give off metallic dust.

if none of those fix it then its time for new sensors.
Happened to one of my collegue with his Corolla S. The sensor was very dirty and uncliped a little bit. Removed, cleaned, put dielectric grease and it work like a charm since 2-3 years now.
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Old 02-22-2017, 04:47 PM   #5
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Originally Posted by Squad-G View Post
Happened to one of my collegue with his Corolla S. The sensor was very dirty and uncliped a little bit. Removed, cleaned, put dielectric grease and it work like a charm since 2-3 years now.
heh, i was dreading having to replace mine.. they are factory originals on the jag and it has about 490,000 on the odo..
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Old 02-22-2017, 05:19 PM   #6
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FWIW, on the rear of the MkIII sensors go into a sealed hub/bearing/carrier assy. that's replaced as a unit.

SO, IDK the details of how it's set up inside - but brake debris shouldn't get in there.

On the other hand, cleaning never hurts as debris in general is a common issue with them.

The only worry I see is that the unit hubs may be getting worn to cause the issue, so checking the rear bearings is indicated.
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Old 02-22-2017, 05:39 PM   #7
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Originally Posted by sailor View Post
FWIW, on the rear of the MkIII sensors go into a sealed hub/bearing/carrier assy. that's replaced as a unit.

SO, IDK the details of how it's set up inside - but brake debris shouldn't get in there.

On the other hand, cleaning never hurts as debris in general is a common issue with them.

The only worry I see is that the unit hubs may be getting worn to cause the issue, so checking the rear bearings is indicated.
cars and dust.. i dont care how sealed it is.. that crap finds a way in
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Old 02-23-2017, 02:05 PM   #8
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Just recieved the replacement correct right rear sensor. I'll try it out this weekend and let everyone know how it went. If it works then I'll go ahead and order the left one. I'm hoping that both going bad at the same time is not a symptom of something worse. FWIW, the inside of the hub where the sensor points into looked great and clean and fine.
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Old 02-23-2017, 02:12 PM   #9
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actually i noticed something on my jag which was built by ford.. i had a code for front right rear left when i fixed the rear left the front right went away i beleive they work like the proportioning system in the brakes when a corner fails it disables the other side opposite to keep braking on at least front and rear
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Old 02-25-2017, 01:01 PM   #10
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Ok, so quick update - just replaced the right rear with the new sensor and that one is showing good on the scans now so I'm off to order the left rear. As long as the new ones don't die soon I'll consider this solved. I'll be back soon to confirm whatever happens with the left rear one when it comes in. Thanks
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