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keep failing NOX new spark plugs and oil change and NOX went higher on 2002 Dodge Stratus

also new thermostat

Asked by for the 2002 Dodge Stratus
do u have eng codes? nox is from high temp in combustion chamber. timing,egr or catt issues
1 more answer
You need to put the same spark plugs that were from initial build. Champion any other will cause problems.