P0401 P0402 Ford Escape
Owners report repeat P0401 and P0402 codes from the differential pressure feedback EGR sensor (DPFE). If you’ve already checked out my DPFE article here, then head right to the muffler. There’s a small drain at the bottom of the muffler to drain off any condensation that accumulates during a cold start. Shops are reporting that the drain can clog and that moisture can damage the DPFE. Open the drain hole and then drill it one size larger. Next, start the vehicle and run it until the exhaust is completely warmed up. Then take it out on the highway to blow out any remaining moisture. When the engine cools down, blow out the DPFE sensor hoses and tubes. If you still have the older metal style sensor, replace it with the updated version.
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© 2012 Rick MuscoplatPosted on by Rick Muscoplat