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Old 01-02-2013, 02:12 AM   #1
Registered User
Join Date: Oct 2012
Location: Liverpool
Posts: 17
My Ride: E46 323i
ABS/Reluctor ring

Hi all,

A couple months ago i got the 3 lights on dash and loss of speedo/fuel mpg gauge which i diagnosed as rear left wheel sensor thanks to this forum

I changed the sensor (cheap off ebay) and all was well again.

However, 2 months later the problem is back. I went and got myself a bmw sensor (ouch) but this did not fix it.

I decised to get myself sorted with inpa/dis and indeed that confirms no signal from rear left wheel. I moved car slowly and all other wheel speeds showing values so its deffo this wheel.

Ive tried the various methods to test the new sensor and even swapped from other side and all seems to say sensor is fine, it is new afterall.

Anyway, on closer inspection looking into the sensor hole i can clearly see the abs ring on the working wheel, but on this rear left it seems 'missing' or at least severely worn away. Interestingly, when i originally replaced the sensor 2mths back i had a right nightmare getting the old torx bolt out, chewed it badly, so bought myself 4 new bolts from bmw so i had them whenever i replaced a sensor. I did notice a the time they were slightly longer than the original, but they went in fine and seemed no contact but im wondering it actually it was just touching the ring and as such worn it/broke it. Hard to see but possible maybe?

Anyway, So im looking now at replacing this ring. I seem to have 3 options.

1. Buy a new ring from (http://www.reluctorrings.com/cars/bmw), remove the driveshaft and then put the new ring on

2. Replace the driveshaft with a used one

3. Buy an aftermarket shaft

Im favouring option 1, mainly as a used shaft might be just as bad and a new one costs much more than just a ring. But has anyone ever done this job? Will i have much hassle getting driveshaft out? Looks like i can drop the sway bar, unbolt the shaft at diff, remove hub axle nut and knock shaft out inwards, then simply reverse with new ring fitted?

Oh yeah, its a 2000 330i sport.

Any guidance, comments appreciated!
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