Got 83 on HC (limit is 66), got .40 on CO (limit is .37) and got 903 on NO (limit is 505).
Plugs were changed, air filter was changed and oil (Mobil 1) was changed prior to test. I checked the thermostat in the air box and is working fine.
Car is ONLY driven in city and has 167,000KM (~ 100,000 miles).
Do you have any suggestions? I've been thinking about replacing the catalytic converter with originalVolvo part.
Thanks.