Questions & Answers for: Buick Century high emissions

...emissions test missions analyzer shows high levels of NOx. Can't find EGR, high coolant temperature, vacuum leak. the egr is usually located near the intake manifold to get down your coolant ...

...don't follow the proper maintenance schedule for you car expect to have some lights go off. I would highly recommend to replace the mass airflow sensor. You also might need to reset your car's ...

...emissions so that I can get an idea on what is too high? You should have gotten a printout with CO, NO, HC levels. Thermostat can impact emissions because one of the things that controls emissions is ...

service engine light Not on but No2 is to high for emmisions do you mean the o2 sensor is reading high ? change the sensor , the CEL does'nt always light up , especially on the OBD1 system, if you ...