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Kenny
Kenny, BMW Technician
Category: BMW
Satisfied Customers: 1122
Experience:  BMW Master Certifed level 1 Technican
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335i: I'm a Toyota technician and working on a 2008 335i BMW

Customer Question

I'm a Toyota technician and working on a 2008 335i BMW and I replaced a passenger rear wheel bearing. ....Now the abs light and brake light stays on, but when I start it and drive for about a minute it goes off and stay off for 30 seconds and comes back on again.
Submitted: 2 years ago.
Category: BMW
Expert:  Kenny replied 2 years ago.
I suspect the wheel bearing is in backwards, The ABS tone ring is in the wheel bearing. You can use a razor blade to detect which side has the tone ring (it is magnetic) also it can be damaged by a magnet so don't get one close to it.
Customer: replied 2 years ago.
I installed it in right....that I know..the first time was in backwards. ..the second time I put in the right way...
Customer: replied 2 years ago.
It goes off then comes back on
Customer: replied 2 years ago.
Kenny , I know you guys are the experts. ..is for some reason I could have a bad speed sensor. ..cause the first time I installed it was put in backwards.
Expert:  Kenny replied 2 years ago.
Ok if the wheel bearing is in correctly,I would inspect the wheel speed sensor for damage and make sure it is fully seated in the wheel carrier.
Even if it was backwards that would not damage the wheel speed sensor.
Customer: replied 2 years ago.
the wheel speed sensor was the first thing I checked...to see if it waseated correctly.
Im not sure how to check the sensor...
Expert:  Kenny replied 2 years ago.
swap it side to side, and recheck the faults.
Customer: replied 2 years ago.
Do you mean swap the sensor from one side to the other
Expert:  Kenny replied 2 years ago.
Yes
Customer: replied 2 years ago.
have you ever saw where the abs light and brake light comes on and goes off then comes back on
Customer: replied 2 years ago.
When I first take off it goes off then comes back on
Customer: replied 2 years ago.
I'm not going to bother you again. .I just thought when I installed it the second time. .it would be fix...
Customer: replied 2 years ago.
I made sure this time it was in correctly. ..
Expert:  Kenny replied 2 years ago.
No I haven't. It has to be related to the corner you have replaced.
Customer: replied 2 years ago.
I thought you guys might have seen it all.
Idont understand what I could have done wrong. ..I installed it on the car.
Customer: replied 2 years ago.
Took the axle out and pressed it out and back in...I didn't even remove the sensor
Expert:  Kenny replied 2 years ago.
I have seen a lot of wheel bearings installed backwards from bodyshops. I haven't seen it come on then go off.
You might have cracked it internally.
Customer: replied 2 years ago.
I don't know ...its possible. .....I'll try another one ...this will be the 3rd time. ..I'm going to be an expert on rear wheel bearing soon
Expert:  Kenny replied 2 years ago.
I meant the wheel speed sensor is cracked internally. I would double check the wheel bearing to make sure it is in correctly.
Customer: replied 2 years ago.
Oh ok...the wheel bearing is in correctly. .I checked to see which side face the sensor when I purchased it......you might be right on the sensor...for some odd reason. .it looks as if it reads it then it looses signal and comes on
Customer: replied 2 years ago.
I need a scan tool to see what codes coming on...
do you know off haND which code is a bad speed sensor
Expert:  Kenny replied 2 years ago.
Sorry I don't.