Make sure your vehicle is maintained properly. A well maintained car is more likely to pass an emissions test. Following the maintenance schedule for spark plugs, air filter, fuel filter and oil regularly can reduce your car's emissions and improve your chances of passing.

Before your emissions test, take your vehicle out for drive on the freeway. Heating up the engine can also help minimize emissions.

Failed your emissions test? Make sure you learn about "waivers" that are available in your county. A waiver was created to help curb costly engine repairs. Waivers range from $75 to $450. Learn more about any waivers available before getting one.

Colors of smoke coming from your exhaust may be an indication of certain problems. It has been said that blue smoke indicates burning oil, while white smoke indicates water in the engine or a gasket issue. Black smoke could be an indication of burning too much fuel. Either way, smoke from the exhaust is an indication of a problem and needs to be fixed right away. If you decide to not go to a mechanic you may burn oil or fuel more than you would like and have to constantly replace either of the two.