Tim's original question asked about "all vehicles", so I didn't think he was just asking about our 986s. I have read and heard that bank one is the side that cylinder #1 is on and that cylinder #1 is the most forward (Forward being relative to the engine with output being at the back). I have read that there are exceptions, but I don't know of any. Was the term 'bank' even used before O2 sensors (fuel injection) was in use?
