Ford P0151 OBD-II Trouble Code Definition: P0151 HO2S21 Sensor Circuit Low Voltage P0151 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0151 O2 Sensor Circuit Low Voltage What does the code mean? OBD-ii Code P0151 definition: Essentially the same as P0136 and P0137 and P0131, a P0151 code definition:the first oxygen sensor on Bank 2 . P0151 […]