'98 Explorer OBD II code P0401

[ahle926]

HI everyone. I have a '98 Explorer XLT AWD with the V8. The check engine light is on and the OBD II is giving me a code of P0401, which is EGR Flow Insufficient. I have replaced the rear cats, as they had a hole in them, and the EGR valve. This did not fix the problem. Any help as to what else it may be would be appreciated.

 

[94xlt4x4]

This could well be the DPFE sensor.

 

[ahle926]

Thank You

thanks, i'll be sure to try that.

 

[mtrsprt43]

I had this problem also and it ended up being a cracked EGR TUBE. I noticed it broke when I change the headers. I thought it was a cracked manifold but ended up being that. I had to change the Egr tube when I went to Torque Monster headers.

 

[ahle926]

Thank you for the reply. It was the dpfe sensor. Definitely saved me a lot of time and money!