## Can a Car Pass Smog with the Engine Light On?
### Introduction
Smog checks are an emissions test that is required by many states and municipalities in order to ensure that vehicles are not emitting excessive levels of pollutants into the air. These tests are typically conducted at an authorized emissions testing center, and if a vehicle fails the test, it will not be allowed to be registered or operated on public roads.
One of the most common reasons for a vehicle to fail a smog test is because the engine light is on. The engine light is an indicator that there is a problem with the vehicle’s emissions system, and if it is on, it is likely that the vehicle will not pass a smog test.
### What the Engine Light Means
The engine light is a warning light that is illuminated when the vehicle’s computer detects a problem with the vehicle’s emissions system. There are a number of different things that can cause the engine light to come on, including:
* A loose or missing gas cap
* A faulty oxygen sensor
* A catalytic converter that is not working properly
* A vacuum leak
* A problem with the fuel injection system
### Can a Car Pass Smog with the Engine Light On?
In most cases, a car will not be able to pass a smog test if the engine light is on. The reason for this is that the engine light is an indicator that there is a problem with the vehicle’s emissions system, and if the emissions system is not working properly, the vehicle will not be able to meet the emissions standards that are required by law.
However, there are some exceptions to this rule. In some cases, a car may be able to pass a smog test even if the engine light is on. This is typically the case if the engine light is on due to a minor problem, such as a loose gas cap or a faulty oxygen sensor. In these cases, the vehicle may still be able to meet the emissions standards, even though the engine light is on.
### What to Do if Your Engine Light Is On
If your engine light is on, it is important to have it checked out by a qualified mechanic as soon as possible. The mechanic will be able to diagnose the problem and make the necessary repairs. Once the repairs have been made, the engine light should go off, and the vehicle should be able to pass a smog test.
### Conclusion
In most cases, a car will not be able to pass a smog test if the engine light is on. However, there are some exceptions to this rule, and it is possible for a car to pass a smog test even if the engine light is on. If your engine light is on, it is important to have it checked out by a qualified mechanic as soon as possible.
