code p01401??????????

[ranger98v]

got back this code from advanced last night; p01401. it is not in my Haynes guide. any one have this info? i can't stand the CEL staring me in the face! it usually means I'm spending more at the pump!

 

[bikerboy]

dpfe sensor circuit high input. It's most likely a bad dpfe but just to be sure here's the steps for diagnosing it. hope it helps and let us know then.

1. Check voltage of the DPFE sensor at the sensor connection on the Brown/Light Green (BN/LG) wire. If the circuit is OK, the circuits voltage will match the reading seen on the scan tool. Normal voltage should be 0.5-1.2 volts Key On Engine Off (KOEO) or at idle.
2. If the voltage reading matches the value seen on the scan tool, check for 5.0 volts measured between the Brown/White (BN/WT) wire and the Grey/Red (GY/RD) wire.
3. If the circuits check as stated, either the sensor is defective, or the sensor has a connection problem.
4. If the voltage measured on the BN/LG wire is different from the value seen on the scan tool, check the BN/LG wire for an open circuit and service it as necessary.

 

[ranger98v]

dpfe sensor circuit high input. It's most likely a bad dpfe but just to be sure here's the steps for diagnosing it. hope it helps and let us know then.

1. Check voltage of the DPFE sensor at the sensor connection on the Brown/Light Green (BN/LG) wire. If the circuit is OK, the circuits voltage will match the reading seen on the scan tool. Normal voltage should be 0.5-1.2 volts Key On Engine Off (KOEO) or at idle.
2. If the voltage reading matches the value seen on the scan tool, check for 5.0 volts measured between the Brown/White (BN/WT) wire and the Grey/Red (GY/RD) wire.
3. If the circuits check as stated, either the sensor is defective, or the sensor has a connection problem.
4. If the voltage measured on the BN/LG wire is different from the value seen on the scan tool, check the BN/LG wire for an open circuit and service it as necessary.

yeah i did all this and came up with the fact that the DPFE sensor itself is defective. go figure right? so i went to my local AutoZone to get one. They told me 50 some odd bucks! yeah wasn't to happy about that. but then ...a ray of light shined down on me and low and behold....the last one i bought was still covered under warranty! They said, bring us the old one and we will give you a new one." As I am a former boyscout, I live by there old motto, "Be Prepared!" Had all my tools with me so in the middle of their parking lot I removed the old one, brought it in and installed the new one. All in all it cost me roughly 15-20 minutes. Nice, right? Now the CEL is no longer staring back at me saying..."you are getting poor fuel economy." among other things. Don't ya just love warranties?!?!

 

[fixizin]

Actually you were probably running LEAN, and getting better MPG, but causing potential damage to various components from higher combustion/exhaust gas temps. That was my case, anyway.

I hate the way the EGR loop can screw up your whole Ranger induction happiness. OTOH, DPFEs are cheap and easy to replace.

PS: Did the DPFE that went bad under warranty have a metal or plastic casing?