So i've purchased a 2nd hand BMW320i from a dealer. All was good until recently the car starts jerking violently. Ive sent it to KWIT- FIT and they couldnt find where the problem is, hence they advise me to bring it to the BMW manufacture. After the diagnostic test, they quoted me a 1600pounds replacement fee!!!!! The car was 5xxx pounds. Ive purchased it in october, and drove less than 3000miles. I've also tried to call the dealer but they refuse to take up any responsibility. The BMW manufacture told me the ABS wheel sensor for both rears and the rear drive shaft was corroded. I would like to get some advise as to what i should do!!!i am just a student and this replacement fee is a HUGE burden for me
P.S: isit normal for the Rear wheel sensor or the Reer shaft to get corrosion? As its the interior of the car, could there be any other possible reasons leading to the corrosion?