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Q: What's the most likely cause for a PO402 code? on 2000 Ford Explorer

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Truck runs and shifts fine when cold, as motor warms it lacks power, surges, and has shift problems but idle is okay.
(1) Answer
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SOMETHING IN THE EGR SYSTEM IS MALFUNCTIONING OR POSS DPFE VALVE. SEEK PROPER DIAG AND EST AS THERE IS SEVERAL THINGS IT COULD BE, INCLUDING PLUGGED EXHAUST SYSTEM
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