[einojuhani]

Hello, after tyre and wheel change all kinds of warning light came on these are seen on the iDrive system. After reading the codes with a professional tool it says error on all 4 abs sensors. The lights come on after a short drive then after restart the errors are gone but then light up again after short drive. I would not believe all 4 sensors went bad at the same time. Battery is brand new and coded. Sensors seem good by the eye. Any help is appreciated.

[DementedF10]

X drive? are the tires all the same size? did you change wheels?

[einojuhani]

The car is not X drive. Only changed tires and the sizes are 225/40 R18 at the front and 235/45 R18 at the rear.

[95blkmax]

Originally Posted by einojuhani

The car is not X drive. Only changed tires and the sizes are 225/40 R18 at the front and 235/45 R18 at the rear.

Just checking on this... Is this situation of running larger diameter tires in the back than the front new with this tire change, or were those the sizes you ran before as well?

I only ask because eventhough you are not xdrive, the car is still expecting the outer diameter of the 4 tires to be MOSTLY the same size. You are running taller tires in the back. This COULD confuse the car into thinking it is in a skid situation as the fronts are spinning faster than the rears, so you would get codes for traction control and ABS (plus any other system that relies on the input of wheel speed).

Just a note for clarification- I am not saying one cant run different size tires. My car for example has different size tires (245/40-19 front, 275/35-19 rear). But the outer diameter is the same, so all wheels spin at the same rate. The particular size combination you are running does not make for equal diameters, thus the potential of creating trouble codes.