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P1409 Can this be a problem with the DPFE sensor? 96 ford thunderbird

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P1409 Can this be a problem with the DPFE sensor? 96 ford thunderbird

Vehicle: 96 ford thunderbird 4.6L

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P1409 EGR vacuum regulator solenoid

Check the vacuum source for this solenoid, One port is for intake vacuum and the other goes to the EGR valve, It can also mean EGR valve is non operational.To test this valve remove the cap , in doing so there will be a vacuum signal, put your finger on it, the EGR valve if it is functional will open and cause the engine to stumble,

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