My car didnt pass the inspection, it overall passed everything except the NOx(ppm)...?

I changed the catalytic converter, exhausts, and i think it could be a sensor or something. Its for a 95 camaro v6 3.4L. How can i find out where the source of it is coming from to make the engine light stop going on? If its a sensor, how can i find where its located and how much do they sell them for at the parts store? Thanks.My car didnt pass the inspection, it overall passed everything except the NOx(ppm)...?You need to go and speak to the chap who did your test. He is the automotive engineer. Hell will, I'm sure, be more than happy to put you in the right direction.



It is hard to say from your description. The problem could be anywhere, really. I suspect one, or even two oxygen sensors that tell the ECU when to meter the fuel and how much. Also the' mass airflow' sensor could be dirty, and thus giving a more than correct reading to the computer.



I would also run the vehicle on a tank full of premium gas, and add a can of B12 to the tank, too. This will clean the injectors, and get rid of any deposits in the cylinder head.



Before you do anything, you might take off the EGR valve and clean off any carbon deposits. The tube that feeds the EGR valve from the exhaust will need to be cleaned out thoroughly, too. I would do this first, before paying out any cash for sensors.

Best of luck

Dr AntonyMy car didnt pass the inspection, it overall passed everything except the NOx(ppm)...?you need a pro to get after it/you are throwing parts at it and it aint fixed yet//thats an expensive way to do itMy car didnt pass the inspection, it overall passed everything except the NOx(ppm)...?go to autozone and have therm hook it up to their diagnistic testor to see what the code is. im guessing its the o2 sensor it is located in your exhaust coming off the manifolds. it takes a special socket to remove it cost is about 10 dollars for the socket the price ot the new o2 sensor is 50 to 75 bucks. also i would change my spark plugs b4 having it rechecked good luckMy car didnt pass the inspection, it overall passed everything except the NOx(ppm)...?you could cheat rather than fix it. run your car till the tank is almost empty. put in 10 gallons of premium gas (no ethanol) and two bottles of rubbing alcohol bounce the trunk enough to mix. drive enough to clear fuel line of unmixed gas and go have it tested right then. it should pass. (mixture will burn hotter and cleaner though not real good for engine it won't hurt it. )



MORE IS NOT BETTER