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A P0442 indicates a EVAP System small leak. While this may be caused by a loose or worn gas cap, as is often the case, it usually points to 1 of 2 other problems. The "small leak" diagnostic indicates a leak as small as .020 inch in diameter which means it could be a leaking line within the evap system. It can also be a stuck open EVAP Vent Valve or a faulty Fuel Tank Pressure Sensor. This diagnostic has to be done by a shop with a scan tool capable of reading Tank Pressure voltage and/or performing a EVAP System Smoke test to find the leak.
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P0442 OBD-II Trouble Code?
Trouble code P0442 means: Evaporative emission control system, small leak detected
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