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What is your question?
I have a 98 Nissan altima P0400 code I was told that egr was restricted with carbon how can I clean it?
1 Reply
If EGR passages are clogged with carbon, they will need to be accessed and cleaned manually. If the valve has debris, it should be replaced. Physical inspection and monitoring EGR flow is needed to verify what is wrong; the code itself will not determine the failure.