What can cause a car to fail a smog check?
What can cause a car to fail a smog check? Contaminated oils are high in Hydrocarbons (HC) and will present a rich mixture to the engine chambers. Avoiding oil changes not only causes pre-mature engine wear but can also cause your vehicle to fail the smog inspection. Change the engine oil. When does Smog Check Come Out the tailpipe? It does not test what is going on when the engine is cold, idling, decelerating, etc. Also, not all the smog a car makes comes out the tailpipe. How to pass an emissions ( smog ) test? 6 Proven Methods for...