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P0400 Code

4K views 0 replies 1 participant last post by  worthirt 
#1 ·
I've tried searching but to no avail. My check engine light comes and goes and keeps showing a P0400 code. I have cleaned the EGR, replaced the vacuum lines, replaced the solenoid (I accidentally broke the vacuum ports while removing the old lines). I'm thinking that I may have to replace the valve itself, but I wanted to ask if the A.I.R system would have anything to do with this? I have a 96 with the L99 in it.
 
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