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  1. Cylinder Misfire - Catalytic Converter

    General E46 Forum
    2004 330i with 170,000 miles had misfire codes which were caused by the catalytic converter. Recently bought the car with a known SES light for lean codes. Fixed those, then had the below adventure. Problem solved thanks to other threads on here. These two in particular...
  2. Four engine codes on my newly purchased 323it

    Driveline, Engine & DME Tuning
    I plugged in my code reader today and found four codes, which all seem to relate to the same area of the engine. The codes are: P0305 - engine misfire cylinder 5 P0150 - 02 Sensor Cirucuit Bank 2 Sensor 1 P1421 - Secondary Air System Bank 2 P0154 - O2 Sensor Circuit No Activity Detected Bank 2...
  3. Cylinder 5 shutting down on cold starts

    General E46 Forum
    So I've had a P0305 for a couple years now. It only occurs on initial cold start. The computer is shutting down Cylinder 5, which I've verified by unplugging the coil to Cyl 5 and there is no change to the already rough idle, however there is dramatic change if I unplug any other coils. The...
  4. Engine running horrible - lots of codes - HELP!!!

    General E46 Forum
    Ok, here's my history. Got a 2000 328i a month ago. Drove it all the way back to Indiana from Texas and it drove great. No codes, so I thought. A few days later, I noticed it was idling rough until it got to temperature. It would be at 700 rpm's and then almost stall as it would drop to...