1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Welcome to Allpar, What are the actual 'P' codes? Seen together they may offer a clue.
See Possible Causes:
http://helpforcars.net/obd_codes/p0340_chrysler.html
See Possible Causes:
http://helpforcars.net/obd_codes/p0340_chrysler.html