My car failed the emissions test - the CO2 reading was too high. Is that usually something major to fix? A friend said it may be the oxygen sensor, whatever that is…
I will likely sell the car but I’m not sure whether to get that sorted out first or if people are likely to buy it as is.
It’s a 89 240sx coupe.
you mean CO not CO2… check your egr operation, check your base timing too
Egr affects NOx. Base timing also mainly affects NOx but can affect hc and co due to scavenging. If you don’t know what a O2 sensor is or what it does, you should honestly just bring the car to a shop.
check for pre o2 exhaust leaks! ECT sensor also could be a possiblity!
If its steady around 1.0 to 2.0 CO, could be cat!
Thanks all for your responses. I probably didn’t make myself clear. I wouldn’t know an egr etc. if it bit me in the umm… ankle so I definitely wasn’t going to try and fix it myself. :oops:
Really I was just trying to ascertain whether a high CO reading necessarily meant a major repair (say over $500). If that’s the case I might just try and sell the car as is if possible, to save myself the hassle of getting it to the shop etc.
Anyways, thanks again.
most emissions problems aside from a bad cat are cheap to fix <$100
if you post all your percentages we can tell you whats wrong for sure