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...

Looking for some help. First time posting. Sorry for anything that I do to classify me as "noob". '99 328i. Car seems to be running fine, but I keep getting engine codes with my reader that can't read the codes except one. Anyone know the definition of these mystery ones? Also what this...

This is my first post to this forum and I apologize if it is misplaced. I have looked everywhere on the forums and cannot find what is causing my Check Engine Light. about 4 months ago I got a P1421 code from the car's computer. It was still cold here in the north and I figured I would wait...