DTC P0401: Insufficient Exhaust Gas RECIRCULATION (EGR) Flow Detected: Notes

WARNING: This page is about a different car, the 2000 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: If ECM replacement is instructed in following testing, always ensure ECM connectors and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

NOTE: For component location, see appropriate illustration in THEORY & OPERATION article.