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P0442 and P0455 OBD2 Codes in 1997 Mitsubishi Eclipse: EVAP System Leak Detected or ECM Issue?

Model: Mitsubishi Eclipse Fault Code: P0442 Posted: 2005-03-20 10:07

I own a 1997 Mitsubishi Eclipse and am experiencing a persistent check engine light with diagnostic codes P0442 and P0455. The evaporative emission control (EVAP) system has been thoroughly inspected for leaks, and no physical leaks have been identified. However, when the vehicle's battery is disconnected for several hours and then reconnected, the check engine light temporarily turns off. After driving the car for a full day, it passes state emissions testing. This intermittent behavior raises concerns: could the Engine Control Module (ECM) be malfunctioning? Is there any known procedure to reset or repair the ECM that would resolve these false positive codes? Any insights or solutions from owners of similar models would be greatly appreciated. Thanks, David

Related fault codes
P0442P0455
Comments (2)
Anonymous 2005-03-20 21:50

David, have you reviewed the official OBD2 code explanations for P0442 and P0-455? You can find detailed information here: https://www.obd-codes.com/p0442 and https://www.obd-codes.com/p0455. A common initial troubleshooting step is to replace the gas cap, as a loose or faulty cap is often the root cause of these codes, even if smoke tests show no leaks.

Anonymous 2005-08-31 08:39

Hi David, I'm experiencing the same issue — P0442 with no detected leaks during smoke testing. I posted about this on August 30th at https://www.obd-codes.com/forums/viewtopic.php?t=169. If you've found a solution, please share it! I'd also be happy to update the community if I discover any further insights or fixes.