P2270: O2 Sensor Signal → Biased/Stuck Lean (Bank 1 Sensor 2)
P2270 is a general DTC trouble code. It means that the oxygen sensor located on bank 1 behind the catalytic converter is continuously sending voltage that indicates a lean air/fuel mixture. This does not necessarily mean that the vehicle is running lean (although it can). It’s usually caused by a bad oxygen sensor, or … Read more