If you live in one of the 30 states or District of Columbia, that require smog checks, you’re probably familiar with the situation. In these states, to combat harmful vehicle emissions, certain cars must pass a smog, or emissions test before you can register or renew registration.
The price for this depends on the state where you live. For example, in California, smog checks are performed at independent service centers, which charge a fee for the test. Conversely, in Illinois, the tests are conducted free-of-charge at state run emission testing centers.
If you fail a smog check, you will need to have work done on your vehicle so it can pass. Some states will allow a car to pass once it has had a certain amount of money spent trying to fix a failed test. Other states require the car to pass to receive new registration regardless of repair price.
Read smog check prices and requirements for your state at DMV.org.