P2406- can a leaky EGR valve cause it?

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Hi everyone, got an issue on the Rover. Getting a CEL, P2406. Last summer when it was in the shop (for a massive fuel leak and running rough), the owner said he found an air leak in the EGR valve assembly. Would that set this code? Running fine now, but would like to fix it before something else pops up. Lol!

If that is the issue, am I better off to replace the valve or the gasket or both? Which brands?
 
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