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Code PO442

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Old 09-24-2011, 01:30 PM   #1
TheFlyingTurkey
Florida
2002 Eddy Bauer 4.6 V8
 
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Code PO442

Evap Emission Control System Leak (small)

I checked the fuel cap and it was tight.

Anyone have any experience with this code on the 4.6L V8? Any ideas what the cause could be?

Thanks!
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Old 09-24-2011, 01:37 PM   #2
TheFlyingTurkey
Florida
2002 Eddy Bauer 4.6 V8
 
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I did a little more searching and found this:

http://www.obd-codes.com/p0442


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

Does anyone have experience with this problem?
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