Second thought to my previous thread: when the engine is cold, on start-up, the ECU uses a default code, hence the O2 sensor is not really used until itÆs at operating temperature. Therefore if it runs funny as soon as it starts, then itÆs probably not the O2 sensor. At least thatÆs how other vehicles that I have owed, run <img src="/forums/images/graemlins/confused.gif" alt="" />