the dioagnostics code reads P0340 and P0430.. so what should i do first and look for? everything looks brand new on this car... i just bought it but the ckeck engine light wont go out...the car passedd emmisions but the light wont go out..even f i reset it..
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1997 Mercury Sable
Question: where should i start ...1997 mercury sable ls has the check engine light came on
Answer #1mastertech6371 March 03, 2012, 04:09Master
re setting does nothing as the problem is still there till you fix it. the 430 code is a bad cat converter. it needs to be replaced.
the 340 is a problem with either the cam sensor, synchronize failure or bad dpfe sensor.
both need to be checked and verified by a shop and get a bid.