also new thermostat
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2002 Dodge Stratus Question: keep failing NOX new spark plugs and oil change and NOX went higher
Greg's Orange Auto (15380 Answers) , Orange, CA - (714) 361-9386globalhelper November 29, 2012, 09:40Master
do u have eng codes? nox is from high temp in combustion chamber. timing,egr or catt issues
Answer #2sullyb April 11, 2013, 14:31Rookie
You need to put the same spark plugs that were from initial build. Champion any other will cause problems.