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P0442 EVAP Emission Control system Leak (Small)

Discussion in 'Stock 2002 - 2005 Explorers' started by HawaiiRob, November 3, 2007.

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  1. HawaiiRob

    HawaiiRob New Member

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    Aloha from Hawaii!
    I have a 2002 Ford Explorer Eddie Bauer, and the service engine soon light has been staying on for months. The first time it came on, I took it to the dealer, who charged my $150 to tell me that the light was on because the gas cap was not fully seated.

    A month later when the light came on a gain, I decided to get my own OBDII code reader & checked it myself. It cmae back with the P0442 description in the title.
    This sounds like the same thing again (gas cap)...

    The cap itself looks fine , & seems to be seated tightly....should I look at replacing that sensor?

    Besides the error, the truck runs great (besides the horribe gas mileage).

    Thanks for any input!

    Rob
     
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  3. rwenzing

    rwenzing Active Member

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    By law, OBDII must run a monitor that can detect even very small leaks in the evaporative emissions system. It uses the engine to apply a light vacuum to the tank, canister and hoses and then monitors a pressure transducer to measure the rate at which the vacuum bleeds off. The smallest leaks can be difficult to pinpoint, so dealers may use a pressurized smoke generator for diagnosis.
     
  4. HawaiiRob

    HawaiiRob New Member

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    Thanks Bob,
    ...since it doesn't seem to affect the performance, it doesn't seem worth it to spend $$ at the dealership having them test it...

    Is this a safety issue?

    Thanks,

    Rob
     
  5. muzzymaniac

    muzzymaniac Active Member

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    I went through this with my old Blazer. I had the same thing for about a year and a half. I pulled the charcoal canister and the canister purge solenoid and put my air compressor to them. I was stuck needing an inspection and then selling the truck so I wanted cheap. Decent sized puffs of dirt came out of both. I was surprised. Anyway, I put everything back together and pulled the battery cable for a while. The light was out and stayed out. I drove it for 3 more weeks with no light and then I sold it. The alternative was to have a mechanic smoke it. I figure that the solenoid had dirt in it keeping it from sealing all the way. My truck was a little older so it was probably a little dirtier. I'm not sure if the Ex's have these same parts or if they operate the same - I've only had mine for a while so I'm still learning about it. Might be work the effort.
     
  6. MountaineerGreen

    MountaineerGreen Towing Moderator Moderator Emeritus

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    I have had this code on my 01 for months, can't shake it- it has morphed into a P0455, large evap leak :banghead: I have disconnected all connections I could find, lubricated the O rings, cleaned the canister, replaced the canister purge valve, still can't get it stopped. Very annoying, I just can't get myself to pony up the cash to get the dealer to find the leak.
     
  7. muzzymaniac

    muzzymaniac Active Member

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    Call around to some local mechanics and see if they have smoke machines. Much cheaper than the dealer. I guess it only takes a few minutes to test.
     
  8. MountaineerGreen

    MountaineerGreen Towing Moderator Moderator Emeritus

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    I live in a very rural area- its all good ole boy shops other than the dealer.
     
  9. 2000XLT4X4

    2000XLT4X4 New Member

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    My 2000 Explorer has had the small evap leak for the past 3 months. I bought a Actron code scanner/reader and cleared the fault, but it came back two days later. My truck has had a gas odor back near the gasfill. I decided to install a new gas cap, cleared the code again. About a week later, same issue.
    Next step may be to replace the filler neck. Looks like a liner around the neck opening that has some hairline cracks in it. Worth a shot.
    Bill
     
  10. MountaineerGreen

    MountaineerGreen Towing Moderator Moderator Emeritus

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    Odd that you updated this today- I got a P0442 again today :banghead: I have a buddy at the dealership, plan to do the smoke test one day after hours.
     

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