P0400 code

[pceby]

I am having the same exact issue as you! Had 2 different guys check it out. I have an aftermarket cone style air intake. After the 2nd guy checked it out and tried coming up with a fix he said to put the stock airbox on. Did you ever find a fix?

[Rebelord]

Have you followed the FSM for the code? It has a good troubleshooting path for the code.

 

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[DanF.]

Hi i bought a 97 pathfinder SE 4x4 and it has a code (P0400) that i cant figure out how to fix. So far I've replaced the EGR, the hoses and EGR vacuum solenoid. As well have checked for leaks but none! If you have any experience on what it may be it would greatly be appreciated! Sorry if theirs already a topic on this i couldn't find one!

 

Start here: http://www.nicoclub.com/FSM/Pathfinder/1997_Pathfinder/ec.pdf

 

Scroll down to EC-76, then EC-78, where it'll refer you to EC-209, and EC-290.

 

 

Here is the parent directory for all R50 Nissan Pathfinders: http://www.nicoclub.com/FSM/Pathfinder/ It helps to provide this link when helping others.

[pceby]

The guy that recently looked at it said to put the stock intake box back on and that may or may not fix the check engine light. He has been the service manager at my uncles Nissan Dealership for 25 years and is really knowledgable. Unfortunately I don't have the stock one around anymore and cant find it online anywhere, and there are no junkyards around that have a pathy. I currently have a short ram intake which in my opinion would not cause the p0400 code.