Hi Everyone-
I'm new to this forum, so forgive me if this posting is not done right.
My wife drives a 2000 S80 with about 55K miles. I started getting the ABS and STC lights on a few months ago, and assumed it was the controller. I sent it to BBA Reman to have it reapired. I guess I should have used Victor Rocha, based on this list, but did not know of him at the time. I called BBA after getting this problem, and they assured me it was tested before it left, but that I could send it back for re-testing. They also said that the Volvo repair was one of their best, whatever that means.
I reinstalled the controller, but now the ABS, STC, and Check Engine lights are on. I get a code of 1550 with my generic code reader. I can erase the code, but then after driving, and subsequently re-starting, the code arrives again. I assume this is a wheel speed sensor? How do you know which sensor? Do you need VADIS to tell? I cleaned them all. The RR was caked in mud, but all this cleaning did no help. Where is the tone ring in the rear wheel hubs? Do I need to remove a dust cover to get to it?
Also, is this the newer type ABS where you can't just test the sensors resistance? I have read that the newer sensors are actually active components, that receive 12V power on one pin, and send a signal on the other, using the bolt as a ground.
Thanks!