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Thread: PO442 Evap Leak - Solved

  1. #1
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    2012 Mazda 5

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    PO442 Evap Leak - Solved

    Hey guys,
    In case anyone else has this problem, here's what I found on the 2012 Mazda 5. Small evap leak P0442 can be several different things starting with a loose fuel cap.

    In my case, it turned out to be the canister vent solenoid which is located at the rear of the car, directly above the center jacking point. You'll see the charcoal canister up there too. Just two nuts and two hoses to get the solenoid off. There is a hole in the jacking plate you can put a socket extension through, and I got the second off with a socket swivel.

    Replaced with Dorman 911711 from Rockauto, $44.

    The way I tested the old one was to remove it and apply 12v to the connectors. Although it clicked really well, I found I could blow a tiny amount of air through it in the closed position, so I crossed my fingers that this was the problem and replaced it.

    vent solenoid.jpg
    Last edited by dougsey; 04-06-2019 at 06:04 PM.

  2. #2
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    2014 Mazda5 GT - 6 MT - White

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    Thanks for posting!

    Today, my 2014 Mazda 5 with with just 66,800 kms (41,507 miles) threw the P0442 code. I'm pretty sure it has nothing to do with the gas cap, and I'm scratching my head trying to figure out how a car with such low mileage is throwing codes already.

    Out of curiosity, what's the mileage in your car?

  3. #3
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    2012 Mazda 5

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    Hi Roboto,
    I have 109k on my 2012. From what I understand, P0442 could be anything in the evap system: loose/faulty gas cap, purge solenoid, vent solenoid, charcoal canister, vacuum leak in any of the many hoses.

    Definitely start by making sure your gas cap is tight, that costs nothing! I think the code will self-clear after a few drive cycles if that was the fix. Or if you have a code reader, tighten the cap and clear the code and see if it returns.

    Please keep us posted.

    Doug

  4. #4
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    2014 Mazda5 Sport 6MT, 1997 Miata

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    I was surfing yesterday and saw this post. Then I got the exact same code this morning on the way to work so it's time to join the game I guess.... Anyway, hunting a EVAP code is always painful.....

    Mine is at 29k and couple weeks ago I hit lightly a stopper curb to my exhaust tip on a parking spot. Hopefully this doesn't cause any damage to the EVAP Component. Only damage I can see is a dent on the exhaust tip. I will go underneath and check during weekend.
    Last edited by kashun842; 05-02-2019 at 09:17 AM.

  5. #5
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    2013 Mazda 5 GT 6MT

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    Nov 2017
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    Quote Originally Posted by kashun842 View Post
    I was surfing yesterday and saw this post. Then I got the exact same code this morning on the way to work so it's time to join the game I guess.... Anyway, hunting a EVAP code is always painful.....

    Mine is at 29k and couple weeks ago I hit lightly a stopper curb to my exhaust tip on a parking spot. Hopefully this doesn't cause any damage to the EVAP Component. Only damage I can see is a dent on the exhaust tip. I will go underneath and check during weekend.
    Ha, add me to this list! Mine is a 2013 with 70,000 kms on it and I got this code a week ago. If I have time I'll try to pull the solenoid out this weekend and see what I can see. I've had luck in the past disassembling the solenoid and cleaning the sealing surfaces inside to fix leaks or sticking closed, so maybe this will work.

    I'll report back if I have any luck.

  6. #6
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    2013 Mazda 5 GT 6MT

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    So I pulled my vent solenoid off yesterday and like @dougsey reported, I could force a little bit of air through it even when closed.

    I opened mine up and cleaned the sealing surfaces and also put a little grease on the end of the piston inside. When I put it back together, it seems to hold air a bit better, but still doesn't seal completely. @dougsey did you try the same test with your new solenoid to see if it's airtight when activated?

    I haven't driven mine much since then, only a couple of short trips, but so far no code set or pending.

    I also noticed that one of the two hoses to the solenoid had no clamp on it, not sure if this is normal. Maybe this is the low pressure/atmospheric side?

  7. #7
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    2012 Mazda 5

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    Hi JM,
    Sadly, I did not test the new part for comparison. I thought of that after I installed it but of course, too late. I tried cleaning the old one by spraying WD-40 into it but it didn't help. Carb cleaner might be a better choice?

    Mine is also missing a hose clamp on one side... I agree with your reasoning on that.

    It will be interesting to see if yours remains code free after a few drive cycles.

  8. #8
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    2013 Mazda 5 GT 6MT

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    Nov 2017
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    Well finally my CEL did come back on, although I had checked the codes after the first 4 or 5 drives and it seemed like it wasn't coming back. Maybe the little bit of grease I put on the valve just dried out and it started to leak again.

    @Dougsey, has yours stayed fixed with the replacement solenoid? I'm a bit hesitant to just shotgun parts, but I feel like my chances are pretty good given how many of us had the problem at similar age/mileages.

  9. #9
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    2012 Mazda 5

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    No issues since replacing the vent solenoid JM!

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