Code P0491
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Thread: Code P0491

  1. #1
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    Code P0491

    Hey guys, my engine light came on a few days ago. I went to autozone and go the code pulled. It was P0491. I searched the passatworld website via google. and found one theard that mentioned P0491 but didn't go into much detail. Anyone have any information. Thanks!!

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  3. #2
    4th Gear
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    That's a leak in your secondary air system. There's a plastic hose that runs from the pump in the passenger fender to the front of the engine near the intake manifold. It's probably cracked. You only have about 15 seconds to diagnose it as it shuts off pretty quickly.

  4. #3
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    So, I should have some turn the car on and put my head near the car over there and listen for air when they shut it off.. THANKS

  5. #4
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    does this hose have a braided cover to it, and does it have a 180 turn in it? thanks.

  6. #5
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    hey guys, anyone have any more input... i called VW dealership today and they want $90 just to look at the car...

  7. #6
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    It looks a lot like that black corrugated tubing that you use to hide stereo or PC wires.

    Here's the diagram for 4 cyl:
    http://www.vagcat.com/epc/cat/vw/PAS...26/49/2838718/

    And 6 cyl:
    http://www.vagcat.com/epc/cat/vw/PAS...26/49/2838812/


    What year and engine do you have?

  8. #7
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    I have a 2002 V6 30V.

    does anything in this picture

    http://www.tobio.info/passat/images/...filter_003.jpg

    have anything to do with my problem?

    thanks alot

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