Ive been surfing posts of 94 knock sensor troubles..Im wondering if volvo has fixed wiring problem by 96 ? I just bought the wagon and seller said o2 needed replaced..did that and read obd2 and code sys too lean posted and cleared next day wife said light came on again checked testing port in eng bay and read rear knock sensor faulty...I havent had a chance to get obd read again to see if pulls same code has anybody with later models had any similar problems?? currently cleaning fuel sys.(throttle body techron in system and playing with fuel press.regulator) has new plugs cap rotor ran out of $ and didnt do wires yet..