ZR-1 Net Registry Forums - View Single Post - New Owner of 90 in Cali!

Franke · 09-21-2018

I had a 1990 with only 55,000 miles on it and it failed NOx testing in Colorado. A guy on this site told me to change the front O2 sensors and that fixed it. O2 Sensors cost about 90 dollars.
The Chevy dealership wanted to change the cats for 4K.

09-21-2018	#9
Franke Join Date: May 2013 Location: Beaver, PA Posts: 516	Re: New Owner of 90 in Cali! - Failed Smog :( I had a 1990 with only 55,000 miles on it and it failed NOx testing in Colorado. A guy on this site told me to change the front O2 sensors and that fixed it. O2 Sensors cost about 90 dollars. The Chevy dealership wanted to change the cats for 4K.