Hi Raymond,
P0400 is an exhaust gas recirculation flow malfunction......
P0400
Exhaust Gas Recirculation Flow Malfunction
Here's the site link below....
http://www.outilsobdfacile.com/data-trouble-code-obd2.php?dtc=p0700-p0999
The fault is somewhere around the EGR valve - probably the EGR valve or the throttle position sensor.
Before replacing any sensors try removing and cleaning the EGR.
Here's a Youtube link that may be of help to you:
1999 maxima egr Google Search
This link explains about the EGR:
P0400 Exhaust Gas Recirculation Flow Malfunction
CEL code P0400 EGR Flow Malfunction
SOURCE: nissan maxima p1800 code and transmission issues, related??
car is 10yrs--components wear and git hot causing failure-work when cool-befor computers just an ignition coil or relay wore-now u nevr kno whats next--synthetic oil like amsoil keeps a trans about 50 degree cooler-that helps alot--
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