Streamlined diagnostic procedure for vehicles with malfunction indicator lamp on and diagnostic trouble codes (dtcs) P0401, P0402, P1400 or P1401. Additional symptoms may include runs rough, lacks power, surge, poor fuel economy. *tt
Related OBD-II Error Codes
Vehicles impacted by this bulletin may show the following OBD DTC.
P0402 [1] Exhaust Gas Recirculation Flow Excessive Detected
P0401 [1] Exhaust Gas Recirculation Flow Insufficient Detected