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i have a 1997 nissan pickup 2.4 liter.the check engine light came on.had code read (p o 402) egr i need a new egr valve or could something be stop up.egr valve was replace about 50,000 mile ago.

There’s a good chance that you just need to clean up all of the passages. Here is a great article I have bookmarked:

This should also be helpful:

I would just check for blockages first and worry about the more complicated testing if that doesn’t turn up anything.