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What is a P1401 code for a 2002 mazda tribute? computer says it has to do with the DPFE sensor.

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What is a P1401 code for a 2002 mazda tribute? The computer says it has to do with the DPFE sensor.

Vehicle: 2002 mazda tribute v6 engine

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This is known as DPFEGR ,This is a signal for the EGR to operate

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