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Q: What do the codes, p1393, and p1406 represent? And what do I replace to remedy. on 1997 Honda Passport

What do codes p1393 and p1406 mean?
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1406 is egr issue. do not replace the valve yet. the code never identifies a bad part, just a failed syste. it may be a clogged intake manifold port.
the 1393 is a rough road sensor. once again, do not replace the sensor until it is checked out.

let a shop check these for you and give you a bid.

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