P38A ABS sensor - that didn't take long...

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plumbfisher

plumbfisher

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Only 5 hours! Hit a deep pothole a couple of weeks ago, beeps and ABS and TC lights came on. Seemed to clear next time I started up only to recur whenever I hit the slightest bump. Then stayed on all the time. After testing with a meter thought it must be the sensor. 'Prise out the sensor and bush' it says in Rave. Hah! After searches on here and much plus gas but still managing to destry the sensor while trying to get it out, I removed the calliper and shield, hub (with the half shaft to save undoing the staked nut). Then the sensor could be driven through with no chance of damaging the reductor(?) ring. All came apart really easily NOT. Hence the five hours, the last hour in the rain...
Took it for a test drive and hallelujah all the warning lights went off.
There is a point to this ramble, a question. Do I now need to get the error codes removed from the ECU?

and thanks to all the various posts that, as ever, helped me to vaguely understand what I was doing.
 
plumbfisher said:
Only 5 hours! Hit a deep pothole a couple of weeks ago, beeps and ABS and TC lights came on. Seemed to clear next time I started up only to recur whenever I hit the slightest bump. Then stayed on all the time. After testing with a meter thought it must be the sensor. 'Prise out the sensor and bush' it says in Rave. Hah! After searches on here and much plus gas but still managing to destry the sensor while trying to get it out, I removed the calliper and shield, hub (with the half shaft to save undoing the staked nut). Then the sensor could be driven through with no chance of damaging the reductor(?) ring. All came apart really easily NOT. Hence the five hours, the last hour in the rain...
Took it for a test drive and hallelujah all the warning lights went off.
There is a point to this ramble, a question. Do I now need to get the error codes removed from the ECU?

and thanks to all the various posts that, as ever, helped me to vaguely understand what I was doing.
Click to expand...

Wont last long your wheel bearing is worn.
 
Thank you so much for your encouraging words (and you too tomcat for liking it):p:p:p:p

I checked it before I changed the sensor and while I was doin it today;)
 
No, no need to get the codes cleared. It might have logged the fault as historical - but it does the self-check every time it starts up.

If you don't have ABS fault on the dash, then you're good to go.
On some of the later (post '99) vehicles if they've had a fault with a sensor, then sometimes the first time you get it powered up and started you might get 'TRACTION FAILURE' with the TC light still on. Once driven above 5mph the ABS and TC lights will go out and it's all happy.... Then there's a reminder of 'TRACTION FALURE' when the ignition is turned off - but on powering up again, there should be no faults and normal operations. I think that's more common on the later WABCO 'D' ECU's (black ones that have a habit of failing!). I get that TRACTION FAILURE thing happening once I hook up a repaired ECU for the first time and it finds the fault has gone...

But as I mentioned - it should self clear, and there be no need for a diagnostics hookup.

Marty
 
plumbfisher said:
Thank you so much for your encouraging words (and you too tomcat for liking it):p:p:p:p

I checked it before I changed the sensor and while I was doin it today;)
Click to expand...

You can listen and take heed or not that is up to you. But a pothole causing an ABS fault is classic of worn wheel bearing. ;);)
 
I always listen to Wammers...

tomcat59alan said:
At least the sensor won't be seized if you have to strip it down again up do the bearing.;)
Click to expand...
and Alan too :)

I did put a big lever on the wheel but couldn't feel any wobble at all. And the sensor was definitely fecked according to the meter readings...

Thanks Marty, that describes it exactly!
 
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