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2002 Volkswagen Passat Question: code p0411



help21, 1.8L 4 Cylinder Turbo, Antioch, CA, April 06, 2011, 01:22

just recieved code p0411 on my passat.secondary air injection system incorrect flow detected.is car safe to drive.what do i need to do to resolove this problem? thank you

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  • Answer #1

    April 06, 2011, 03:33

    Found online:

    Trouble Code: P0411

    Secondary Air Injection System Upstream Flow Detected
    Possible Causes:

    Air pump output is blocked or restricted AIR bypass solenoid is leaking or it is restricted AIR bypass solenoid is stuck open or stuck closed Check valve (one or more) is damaged or leaking Electric air injection pump hose(s) leaking Electric air injection pump is damaged or faulty ECM has failed.

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    mastertech6371, April 06, 2011, 09:40

    pump failure is common on this model. replacing the pump, check valve and making sure the fuse is good is usually the answer for this issue. it is pricy but works.
    the system adds air in cold operation to finish complete combustion in the exhaust manifold so there is no unburnt fuel going to the cat.

    How are you Ron?

    thanks for using repairpal.


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