Hi all,

 

I have had a font bearing fitted to my 1.4 TDCI Mk7. I purchased a ***** ABS bearing removed the hub and paid a garage to press it in. After re-fitting the HUB abs light has come on and the code indicated the sensor. I was surprised as I was extremely careful with the sensor. Anyway purchased new sensor now fitted and i have the  same issue ☹ When I clear the code the ABS light stays off until you hit about 5MPH.

I am suspecting the bearing has been damaged during installation or fitted the wrong way. I have checked though and the red ring on the bearing is towards the sensor and I put small screw driver down the ABS hole and the bearing is magnetic. SO I am thinking it is installed the correct way ??  As I do not have a press I have never actually pressed a bearing in so maybe someone with more experience knows which side is correct?

Before I go and get a new bearing has  anyone got any other ideas what could be causing it? Is there anyway to check on the wiring to the ABS sensor just so I can eliminate that?

Really annoyed with it, as I was going to go cheap on the bearing and decided not to and bought a decent brand!! Garage who fitted it is a good  garage so would be shocked as well if it is the incorrect way.   Bit stuck now on what else other than the bearing it could be. 

 

Googling I have seen posts where people say the sensors need programming? Any truth in this? 

 

Thanks

 

 

I think this has come up on here before. The bearing is backwards. I think one side is magnetic and the other is not so the sensor cannot detect it. I bet if you do a search you'll find some more specific details.

1 hour ago, runamonk said:

The bearing is backwards. 

Yep sounds right, though I've never done such bearing but know of someone who had the same problem and it was indeed the bearing being fitted the wrong way.

Unplug the sensor and put a multimeter on the sensor pins. Spin the wheel once every 2 seconds and the meter should show 0.2 vac or more. Typically it is 250mv ac if it is picking the signal up from the encoder.

Ok thanks I try this the other day but had difficulties keeping the multimeter on the pins. Tomorrow Ill do it properly and check it 🙂