I just have a question about my emissions test i just took.
Even though i passed my test it was by slim margin in one category.
NO(Nitrogen Oxides) ppm. My car read 578 ppm. The limit in my area is 580 ppm.
I am just wondering if anyone could explain what would cause this?
thanks. any other possible cause?
I am also experiencing this problem. I have run the Drive Clean test and failed 4 times now. The only part that is failing is the N2O levels. My 94 Sunbird LE 3.1V6 is putting out 1000+ppm N20, and is only allowed 550 ppm to pass. The garage said my EGR valve needed to be replaced and I replaced it, but still no change to the N2O levels. Any thoughts?
replace catalytic converter
