Questions & Answers for: failed emissions high nox

...failed inspection recently for high NOX emissions. The car seems to run OK, but I am not sure how to fix this NOX problem. Anybody have a clue? thanks... yes the cadallac converter produces nox ...

emissions 4 times and failed everytime on nox only, my numbers dropped a little everytime with repairs until i put the new egr valve on then my numbers shot up higher then they were in the first place

failed emissions....high nox 25 test 15 test hc 7 9 co .02 .13 no 1354 172 fails emissions test on the 25 test. allowable nox is 712 but i'm almost double. initially it had failed on both tests with ...

1999 Saturn failed emission test due to high NOx. Mileage is 103,000 km. 1.9 litre sohc high NOx is an indication of a bad egr system or the catalytic convertor

Failed emissions test again,nox is high and Co's are too,what are the air/fuel settings and timing specs. Failed emissions test again,nox is high and Co's are too,what are the air/fuel ...

...failed 2 emission they say it is a the NOx is to high what would cause that? What causes High NOX EmissionsThousands of technicians have faced the challenge of bringing a particularly stubborn ...

...high nox high nox emission what is the make ,model and year please EGR Valve is supposed to be there to keep NOX at acceptable levels So check that it is working correctly Rules for going to ...

...high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help ...

...failed twice with readings with very high emissions in each category. I replaced the Catalytc Converter. It passes with the very best readings in all catagories, but FAILS IN ONE: the failing is with ...

failed emissions on for nox are there any easy fixes for this I have a 1998 nissan altima and i just failed emissions in colorado for Nox levels too high the limit was 1.5 and mine were 1.9 i did have