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Discussion Starter #1 (Edited)
2008 E90 was giving poor performance, very juddery, lights on the dash for traction control. I replaced the MAF, EGR, checked for turbo leaks, and stripped the turbo.
Due to tips from 'Clearwaterboy' on here I decided to look at the rear ABS sensors even though there were no ABS warning lights.

I found the Reluctor/ tuning ring on the end of the shaft was distorted due to expanding rust around the circumference. You could clearly see where the sensor was being scraped by the non concentric ring. This meant that the distance between the sensor and the ring was uneven so it upset the ABS system and was reducing performance, but not throwing up ABS warning lights.
So.....check your ABS sensors if you have unexplained performance problems!
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