I've had the abs light on since I bought the car 11/11. I got wheel bearing and hub replaced on the passenger front. After replacement my speedometer registers half the speed. I recently checked the abs code and it's reading 31 (right rear speed sensor open circuit). Ses light is on Po300 (random cylinder misfire) po155 (02 sensor bank 2 sensor 1) po110 (iat sensor) << this last one is new. I'm assuming the random deals with my head gasket leak. And the 02 sensor. Well, why not have it go wrong to but possibly also dealing with head gasket. Maybe. Anyways this is only some of what's going on but curious if it is the wheel speed sensor effecting the speedometer and why abs is only reading right rear.