Ford P1151 OBD-II Trouble Code Definition: P1151 Lack Of HO2S21 Switch – Sensor Indicates Lean P1151 Ford OBD-II Trouble CodeDescription: Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1151 OBD Code Description Lack Of HO2S21 Switch – Sensor Indicates Lean is one of the definitions for the P1151; however your vehicle’s manufacturer may […]