* The check engine light is not always triggered by emissions-related problems. Some emissions-related problems, such as a fuel vapor leak, may not cause the check engine light to come on.
* The check engine light may be burned out or have a loose connection. If the check engine light is not working properly, it will not come on even if your car is having emissions problems.
* The emissions problem may have just developed. If the emissions problem developed just before you took your car in for the test, the check engine light may not have had time to come on yet.
If your car fails an emissions test, it is important to have it diagnosed by a qualified mechanic to determine the cause of the problem. The mechanic will be able to repair the problem and reset the check engine light.
Here are some things you can do to help prevent your car from failing an emissions test:
* Keep up with regular maintenance. This includes changing your oil regularly, replacing your air filter, and tune-ups.
* Use the correct fuel for your car. Using the wrong fuel can damage your car's emissions system.
* Avoid idling your car for long periods of time. Idling can cause your car to emit more pollutants.
* Drive your car regularly. Cars that are driven regularly are less likely to develop emissions problems.
