tdipwr
Well-known member
Ok I just bought a 06 tdi with 187,000 miles it was in limp mode pretty much my intire 6 hr trip home. I found a vacuum line that was off and that fixed the limp mode still ran kinda bad. Cel was on two codes one was mass air flow and one was o2 sensor. I replaced the mass air sensor but still running bad. It runs great as long as you don’t push the pedal down much past 1/4 throttle then it starts acting up. My question is can a bad o2 sensor do this? It almost acts like something restricting it under load. It will rev fine in neautral but struggles under a load. Any suggestions would be greatly appreciated.