My 1997 850 failed its Colorado emissions test for first time since I bought it and wanted to get some insight as to what should be done so I don't get bent over by dealer. The car failed to pass the NOx and CO2 hurdle set by state of Colorado. I have read the it might be good to flush the fuel injector. Any other thoughts. I replaced parts with only genuine Volvo parts and have had no major repairs with the car, 121K miles.

 

Can you post the NOX and CO2 readings? When was the last time you changed the O2 sensors?

 

Hi Covolvo,

I would do the following:

Visit a local AutoZone or another auto parts shop where they provide free diagnostic service and see if there are codes stored.

Exactly how long ago did the car receive good tune-up? Please refer to the following thread FYR:

https://volvoforums.com/m_48928/tm.htm

Many things could affect those emissions numbers and without knowing precise service/operating conditions and testing the car myself, it is difficult to suggest much, other than the tune-up items I posted in the thread I introduced above.

I hope this gives you some ideas. Good luck,


JPN