Ford P0153 OBD-II Trouble Code Definition: P0153 HO2S21 Sensor Circuit Slow Response P0153 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0153 O2 Sensor Circuit Slow Response What does the code mean? OBD-ii Code P0153 definition: This involves the oxygen sensor upstream the catalytic converter on Bank 2. This code indicates the engine air fuel ratio is […]