What do codes p1393 and p1406 mean?
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1997 Honda Passport Question: What do the codes, p1393, and p1406 represent? And what do I replace to remedy.
Answer #1mastertech6371 September 30, 2011, 13:56Master
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.