Ford P1131 OBD-II Trouble Code Definition: P1131 Lack Of HO2S Switch – Sensor Indicates Lean P1131 Ford OBD-II Trouble CodeDescription: Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1131 OBD Code Description Lack Of HO2S Switch – Sensor Indicates Lean is one of the definitions for the P1131; however your vehicle’s manufacturer may […]