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Hello, I have a 2006 Jeep srt8 , 6.1L Hemi that failed emission test here in the state of Colorado
I did a complete tune up all spark plugs ngk's,air filter, oil change, thermostat, changed the water pump,and did a coolant flush, all new O2 sensors and its still not passing, the issue is NOx level is too high the limit is 1.5000 and the first test came out at 1.9434 and 1 month later after the tune up it was 2.1933 all the other readings were fine, just the NOx is too high any ideas how to lower this reading with NOx? The jeep has 224,615 miles on it and still running stong btw
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