If your car doesn't pass the emissions test, try some do-it-yourself tricks first. Two of those tricks include getting an oil change and putting air in the tires. These steps can also increase your chances of passing the emissions test. If those steps don't work, you could be looking at mechanical issues. If that's the case, you'll need to take care of the repairs before you retest your car.
Catalytic Converter
If your car hasn't passed the smog test yet, you need to have the catalytic converter inspected. Many emissions problems stem from the catalytic converter. When the catalytic converter stops working, air and burnt fuel can't get processed the right way. As a result, your car releases more harmful gases into the environment. Plus, your car runs less efficiently. If there are problems with your catalytic converter, visit a repair shop right away.
Ignition System
If the ignition system in your car is defective, you'll need repairs right away. A faulty ignition system can prevent your car from passing the smog test. If you've got a faulty ignition system in your car, it can affect the timing. This can increase emissions, and lead to a failed smog test. Once you get the ignition system repaired, your car should pass the emissions test.
Oxygen Sensor
If your car failed the emission test, take a look at your fuel usage. If you're using more fuel than usual, there could be a problem with the oxygen sensor. When the oxygen sensor fails, your engine doesn't get the right fuel-to-oxygen mixture. This problem can increase fuel usage.
But, it can also cause your car to fail the emissions test. If you're losing out on fuel mileage, take your car in for repairs. Repairing the oxygen sensor will improve your fuel mileage. It will also increase your chances of passing the next emissions test.
Fuel System
If your emissions test shows that your car is running too rich, now's the time to visit a repair shop. Problems with the fuel system can cause problems with the fuel mixture. Two problems that can cause fuel system problems include dirty fuel filters and clogged fuel injectors. A repair shop can take care of those issues for you. They can also retest your car's emissions once they're done with the repairs. That way, you can avoid the long line at the emissions center.
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