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Q:

What does these codes mean;P0430,P0420,P0344,P0430,P04320. Can I fix these mysel on 2003 Chrysler Concorde

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(1) Answer
cat converter codes are the 420,430. the cam sensor is the 344.
can you fix it?? sure but replacing the cats is not an easy job. it pays around 2 hours for a shop but yourself may be double the time.
the 344 needs to be checked to verify the failure.

Roy