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Q: High NOx levels and failed smog test 5 times. replaced cat,plugs,cap,O2,intake on 1992 Jeep Cherokee

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
gasket,exhaust manifold, oil, oil filter, coolant,injector seals, and MAP sensor. Still getting 1300 read @ 25mph. this sucks
(1) Answer
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NOX IS CREATED BY HIGH COMBUSTION TEMPS. IS COOLING SYSTEM IN GOOD SHAPE AND ANYTHING ELSE THAT WOULD RAISE CYCLINDER TEMPS.
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