While O2 sensors have no fixed replacement schedule, your driving style and the health of other engine components can ...

Imagine quickly diagnosing why your car's check engine light is on. A scan tool, also known as a trouble code reader, can help you identify the problem yourself. Our editors and experts handpick every ...

A P0171 code appears in the engine control unit when the oxygen sensor on bank 1 recognizes too lean of an air-fuel mixture for the sensor to correct it. Several different things could cause this ...