DTC P0441, DTC P0442, DTC P0446 Or DTC P0456: Notes

WARNING: This page is about a different car, the 2003 Lexus GX 470. 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 harness connector 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 - LEXUS article in GENERAL INFORMATION.

Code Definition

DTC P0441: Evaporative Emission Control System Incorrect Purge Flow
DTC P0442: Evaporative Emission Control System Leak Detected (Small Leak)
DTC P0446: Evaporative Emission Control System Vent Control Circuit
DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)