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P0400 Exhaust Gas Recirculation Flow Malfunction. This can be many things. I would start by cleaning the EGR valve throughly and checking all EGR vacuum lines. If you have already done this then it may be time to take it to a pro before you spend more money needlessly. or http://carfix.stufftoread.com/EFI-1.html free advice no ads !

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Q: What can you do when you understand the meaning of the P0400 fault code and you can clear it but changing parts did not help on a Sidekick?
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