SOURCE: 2002 ford focus p0401
Here is a list of possible causes for a PO401, hope this helps.
SOURCE: eobd code 4010 insufficient flow to egr valve on 2001 ford maveri
dpbeffe sensors on fords are a common problem I had the same issue with several fords of same year new sensor from ford only cost me 38$ from ford just make sure both tubes to dpfe are clear though any blockage screws up the reading from the sensor
SOURCE: my 2001 E150 4.2L has a high input EGR sensor problem
Check the pipe that feeds the DPFE for cracks, if that's ok, check the Engine's back pressure at the front O2 sensor port. It should have no more than about 1 lb of back pressure max. If it's higher, you may have a faulty cat converter. (they're not cheap) When they go they sometimes plug the muffler with debris.
SOURCE: 2002 Ford Escape (V6) P0401 P0402 nightmare
Sounds like you have a vacuum leak, a problem with the wiring, or a bad PCM. Check wiring for pinched, chafed, pierced, or broken wires. Make sure vacuum supply is good, and not collapsing when the vehicle is running. Beyond that, a trip to the dealer may be in order.
SOURCE: p401 emission code ford escape 2001 6cyl
P0401 shows an Exhaust Gas Recirculation Flow Insufficient. Without a good scan-tool you will be playing the "Parts Changing Game". Insufficient flow can be the result of a vacuum leak, bad MAP sensor, an exhaust leak, faulty EBP sensor, carbon build-up, and so on. I wish I could say more but with all the electronics it is more complicated then earlier cars.
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