Cars running really rough at idle and through up a P0420 CEL
plugged it in to the computer and checked it all out and the voltage for the 2nd o2 (lambda) sensor is reading unusually high like 3-8 volts, the front one is perfect running between 0.2-0.8v and fluctuating.
Problem is though i dont know if this is normal or not? anyone know anything about sensors.
Im running, 2002 WRX, no BOV, fully decatted, stage 2 map, CAI K&N typhoon