P0xxx are standard codes shares between all vehicles made for US after 1996. P1xxx are model specific codes.
Note - Vehicles made outside the US, not for import to the US did not go to this standard until 2000-2001. Plus some diesel models do not follow the standard codes.
I found this to be one of the better links to get info from. Scroll down to see standard codes. Click on a manufacture to see specific codes.
Codes P0442 - http://www.obd-codes.com/p0442
Technical Description - Evaporative Emission Control System Leak Detected (small leak)
What does that mean? This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
Symptoms You likely won't notice any drivability problems.
Causes A code P0442 most likely means one or more of the following has happened: •A loose or improperly affixed gas cap •A non-conforming gas cap (i.e. not factory/original brand) •A small leak/hole in a fuel vapor hose/tube •Other small leak in EVAP system •Faulty vent o-ring seal
Possible Solutions With a P0442, the most common repair is to: •Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back. •Otherwise, replace the gas cap, or •Inspect the EVAP system for cuts/holes in tubes/hoses
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