Question about 2002 Mazda Protege

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Diagnostic code PO442

What does diagnostic code PO442 entail?

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PO442 is an Evaporation Emission leak. It's probably a loose gas cap. The fix would be $96.00 at our dealership, since your truck is out of warranty. You may be able to get it fixed cheaper, but you'll be charged a diagnostic fee.

Posted on Jun 29, 2008

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2002 Buick Regal Service Engine Soon light PO442 diagnostic code


That is an emissions code. It means you have a small leak in one of the lines. Most likely it the line that goes from the engine to the evap canister in the drivers side rear inner fender well.

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What do I do to find out what the problem is? 2002 monte carlo engine light is on. diagnostic code PO442


A simple google search reveals this is a small leak in the emissions canister system vacuum lines. This can be as simple as a bad gas cap, or a cracked or broken vacuum hose.

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Need my Liberty to pass smog I recently had codes po445 and po442, will this be a problem for passing smog if check engine light isn't on? Not sure if problem was resolved with new gas cap.


if your check engine light isn't on, they will still hook up a diagnostic code tester to your vehicle to see if the computer has picked up any problems, if the computer has picked up a problem, and you fixed the problem, then you can have the code removed from the system, with a diagnostic code tester.

May 16, 2011 | 2002 Jeep Liberty

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Diagnostic codes PO442, PO305 and PO455 comes up on the computer. What do these codes mean?


P0305....Cylinder 5 Misfire Detected


P0442....Evaporative Emission Control System Leak Detected (small leak)


P0455....Evaporative Emission Control System Leak Detected (gross leak)

Feb 11, 2011 | 2001 Dodge Caravan

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Failed Emision test


po442 is evap emission control system leak (small) 1 of the lines for emissions is leaking. po455 is-- emission control system leak (large). turn off light with code scanner after it is fixed.

Sep 01, 2009 | 2001 Dodge Caravan

2 Answers

Check engine light code PO442


You likely won't notice any drivability problems. P0442 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.

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.

Good luck and hope this helps

May 07, 2009 | 2001 Volvo S60

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