My 98 V70 has a random issue were the abs pump cycles then the abs/trac warning lights illuminate. The warning lights will reset after the car has been parked and off for a while. I checked the wheel sensor connections and cleaned the tips of the sensors which had a little bit of build-up. The car had the abs module changed by the prior owner. I had the master cylinder changed due to leakage and the system was flushed at that time. The issues were present prior to that work. Any suggestions or ideas would be greatly appreciated. Just don't want to throw any expensive parts (abs module) at it with out being sure.

 

You need a reman module. Check bba-reman.com.