Ive been working on my car, changed cat, o2 sensor, erg valve, cleaned egr intake and much more i took it to smog and it failed due to high nox. What could be causing high nox?
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Ive been working on my car, changed cat, o2 sensor, erg valve, cleaned egr intake and much more i took it to smog and it failed due to high nox. What could be causing high nox?