Question about 2000 Ford Mustang

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I have a 2000 Mustang that has been to the dealership 3 times since December. Service engine light came on, diagnosed with PO411 code and they replaced the diverter valve. Car started spark knocking really bad and idling rough, so they replaced the air valve solenoid. Now it's doing the same thing and they are now saying that it may be the egr valve. Are these the symptoms of an erg valve gone bad?

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I look for some info for the code P-0411 and in the code description for diagnostic sends me to the code P-1411 and the possible causes for this code are the following components

  • Electric AIR Pump
  • Hose from AIR pump leak
  • AIR bypass solenoid leak/blocked
  • Hose from AIR pump blocked
  • AIR bypass solenoid stuck open/closed
In order to properly diagnose the problem of the vehicle you have to be sure that the code P-0411 is the primary Diagnostic trouble code because if are any other code prior to this code that you listed here, then the diagnose have to be made by that code that is first. but if that is the only code that the vehicle have then your problem is not on the egr system, your problem is on the secondary air injection system

Posted on Mar 21, 2011

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Yes, it's possible, but the valve can be tested rather than just replacing it, as there are other possible reasons for the knocking. Knock can also be caused by bad knock sensors. They are not troubleshooting properly. These parts should be tested before replacing. What is the current trouble code?

Posted on Mar 21, 2011

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1 Answer

I have a 2000 Ford Mustang Convertible with error code P0411. I first noticed the check engine light come on and I noted some irregular idling, vibration felt in driver's seat, misfire after hard acc


A check valve is located in the air supply line to keep exhaust gasses from flowing into the pump

Read more at: https://www.obd-codes.com/p0411
Copyright OBD-Codes.com

Secondary Air Injection System Incorrect Flow Detected

Read more at: https://www.obd-codes.com/p0411
Copyright OBD-Codes.com

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Po411


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