Before the emission test make sure your air filter is clean, change the oil, and make sure your engine is in tune. Worn spark plugs are the #1 emission item that will usually fail the car. Make sure the check engine light works properly. To check the light, turn on the ignition, the light should come on for a second or two and then go off. After the engine has started the light should remain off. If your light is on they will fail the car.
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