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p0400

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costas14

costas14

15+ Year Contributor
489
0
Mar 7, 2008
quincy, Massachusetts
p0400 code keeps coming up, i noticed i have 2 sensors on the firewall with vacum lines going to them, the one on the driver side sometimes ticks very loudly, is that the one or what?
 
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a P0400 code is for egr system malfunction.

Do a vaccume test on your EGR 4.5 inHg max, if it dosnt hold vacuume then its bad.
 
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