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I'm trying to find out what these codes for my car means from this diagnostic test the codes are po491, and po492?

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Both are fuel injection trouble codes. Possible causes are:

  • 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

Posted on Jul 29, 2009

  • Greg Margossian
    Greg Margossian Jul 30, 2009

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