Maintenance Tips To Pass Your Next Smog Test

27 February 2018
 Categories: Automotive, Blog

Smog tests are a legal requirement in many states. They are meant to ensure that whatever your car emits is within the limits prescribed by law.

You do not want to fail the smog test as this will cost you time and money. You will have to go through the test again and pay for another test.

Check Engine Light

If this light is on, you may not automatically fail the smog test, depending on your state. However, it is a sign that something is wrong with your car. Take your vehicle for diagnosis at a reputable auto repair shop.


Short, slow trips over time will allow harmful residue to build up in your engine. Before going for the smog test, drive your car at high speed on the highway.

This will enable the catalytic converter to function at its fullest. The catalytic converter is responsible for converting pollutants into less harmful elements. Maintain this practice for up to two weeks leading up to the test.

Oil Change

Dirty oil produces more pollutants into the air. Check your oil visually to see if it needs changing. If you are close to your scheduled oil change, you may as well get it done before the smog test.


Conduct maintenance procedures such as tune-ups well before the smog test to allow your car's diagnostic equipment enough time to reset. These monitors are necessary to measure emissions. If they are not functioning properly, you will fail the smog test.

Fuel Additives

You could use fuel additives to unclog fuel injectors, especially for older cars. These help to clean up your fuel pathways of carbon deposits.

Inflate Tires

As part of the smog test, your car is made to run at high speed on a roller while stationary. When the tires are poorly inflated, the engine overworks and produces more pollutants.

Fill up on Gas and Anti-freeze

To survive high speed runs, you need to top-up your gas and anti-freeze. Low fuel levels will expose the fuel pump causing your car to fail the test. On the other hand, insufficient coolant may cause your engine to overheat.

Warm Up

Your car performs optimally when warm, so drive it around for ten to fifteen miles as you head for the inspection station.

There are many measures you can take to ensure you pass your smog test but nothing beats proper and regular maintenance. Visit your auto repair services shop to schedule a check-up.