2000 A2 1.4 AUA - ABS Sensor

Topsie

Topsie

Member
Afternoon all,

Just got all the work completed following an MOT, just test drive the car and it threw an ABS, ESC and red explanation light at me.

Checked the codes with a snap-on solus edge and got:

00290 - ABS Wheel Speed Sensor, Rear Left - G46 Mechanical Malfunction - Intermittent

Only when I check Rosstech, 00290 is signal outside specification or electrical fault in circuit, with 00285 being mechanical malfunction.

Cleaned the sensor to no avail, I’m guessing it’s just a new sensor. I’m aware it could be the sensor ring on the hub, but I don’t fancy spending out on both unnecessarily.

Any ideas or tips?

Nick
 
If you have VCDS then you can use the graph function to monitor the data from all sensors to compare their output, here's an example I pulled from the web. This will show whether you are getting any data from the rear left.
If there is data but it's incomplete, then it's either a poor connection, or if the errors are consistent, bad sectors on the magnetic ring of the hub.
If there is no data, then it's either a bad connection or a faulty sensor.

Screenshot 2022-03-08 at 13.54.59.png
 
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I had this issue a few years ago - turned out that one of the springs on the back brake shoe had come adrift and was coming into contact with the hub which has the magnetic ring on the back and was throwing out the sensor. I removed the hub and drum (quite easy) and cleaned everything up and put back together and this fixed the issue. Worth a try. You can also inspect the ring and sensor when you have apart and check for damage or crud build up. Luckily i have full VCDS so I was able to check and clear fault - hope that helps - Brent
 
Cheers all,

I’ve got a cheapo sensor from eBay to see if it’s a simple fix, if not it’ll be drum off and inspect time. I don’t have VCDS but the local garage was nice enough to let me read the codes in exchange for lending a hand moving a fridge!

Nick
 
And the cheapo sensor has fixed it (until of course, it breaks again, being a cheapo sensor)!

Cheers for the help.

Nick
 
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