CEL came on went to Shucks came up with this erro code p401 whatshould I check first thx

 

P0401 EGR Flow Insufficient Detected

It's most always the DPFE sensor (AKA: EGR Valve Pressure Sensor if you are going to look for it at Autozone) It's silver and about the size and shape of a box of cigarettes. It's usually located off the driver's side of the engine. Follow the two rubber hoses off the drivers side exhaust manifold and it will be on the other end. Make sure you get the hoses cleaned out too. They have a habit of clogging.

 

THX for the Info

 

On my truck it looks like a silver flying saucer. I read somewhere on this board that you can soak it in something and it will usually clear out the carbon deposits and fix the air flow issue.

I think my code was: p1401

 

seafoam
napa sells it

 

Well i went to napa got a new dpfe sensor $63 later,reset computer CEL came back on after about 20min. whats next ???

 

Same code?

Not trying to insult, but ....
Did you ensure it was all hooked back up properly?
Did you ensure the hoses were clear and the tubes coming off the exhaust?

 

Check behind your battery for rotten vacuum lines. This is where the vac supply to the egr control circuit comes from. That is what was causing P0401 on my 97 5.4 expedition..
If you have a 4.6 clogged egr ports are very common..
If you search on p0401 you will find some threads that have pictures and procedures for cleaning the ports.

 

Yes Its hooked up right I cleaned the hoses out to they weren't clogged up . Ill check vac lines , someone said something about o2sensors??????