2006 Cobalt Throwing Diagnostic Code P0304

Discussion in 'Tuning' started by Cobalt2006, Jan 22, 2023 at 6:14 PM.

  1. Cobalt2006

    Cobalt2006 Junior Member

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    Hi Everyone

    My 2006 Cobalt with a 2.2L engine (141,666 miles) is throwing diagnostic code P0304. I understand the code is related to a cylinder 4 misfire that could be caused by a bad ignition coil, spark plug or fuel injector, etc.

    The car has AC Delco iridium plugs with about 40,000 miles on them and cylinder 4 plug looks clean.

    Can anyone let me know if the ignition coils are known to be faulty for this year Cobalts? And, if there is a way to test the ignition coils?

    Thanks
     

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