Will Car Pass Smog Test With Check Engine Light On

Your car’s computer system is constantly monitoring various aspects of your vehicle in order to ensure that it is functioning properly. One of these systems is the check engine light, which can indicate a problem with one or more of your car’s emissions control devices.

If you have a check engine light on, here are some things you should do:

1. Check your car’s air filters. Car filters help to reduce harmful particles and toxins from entering your engine, and if they are dirty or missing, they can cause the check engine light to come on. So make sure to change your air filter regularly and always use a quality filter.

2. Check for faulty emissions sensors. Emissions sensors are responsible for measuring the amount of pollutants in the air and sending that information to your car’s computer system. If there is a malfunction with an emissions sensor, this can cause the check engine light to come on. In most cases, fixing this issue will resolve the check engine light issue.

3. Replace worn out parts. Just like any other mechanical device in your car, your engine will eventually wear out and need to be replaced. If one of these parts is causing your check engine light.

What is the Check Engine Light and What Does It Mean?

The Check Engine Light (CEL) is a warning light that comes on in a vehicle’s dashboard when there is an issue with the engine. The CEL may or may not be accompanied by a message on the instrument panel.

The most common problems that cause the CEL to come on are faulty emissions controls or a misfire in one of the car’s cylinders. If you have the CEL lit up and your car has recently passed a smog test, it’s likely that your issue is simply something that needs to be fixed rather than causing major problems. However, if the CEL is coming on for reasons that you can’t quite figure out, it’s important to take it to a mechanic and have them check it out.

How to Fix a Check Engine Light

The check engine light may come on for a variety of reasons, but one of the most common is an issue with the vehicle’s emissions system. In this article, we’ll show you how to fix a check engine light using simple steps.

Test Drive the Vehicle and Look for Smog Problems

When you’re ready to buy a car, it’s important to do your research. Check the car’s history, and make sure it’s been through a smog test. In some states, smog tests are required before you can buy a car. If you see a check engine light on, don’t just assume the car won’t pass the smog test. Talk to the seller about the problem and see if they can fix it before you take it for a test drive.

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What to Do If You Find Smog Problems on a Test drive

If you find that your car has smog problems, don’t panic. There are a few things you can do to try and fix the issue before taking your car in for a test drive.

First, check to see if the problem is with the emissions system or the engine. If it’s the emissions system, you’ll need to take your car to a mechanic to have it fixed. If it’s the engine, you can try fixing the issue yourself. Here are some tips:

– Check to make sure that all of the air filters are clean and properly installed. Dirty air filters can cause problems with emissions.

– Make sure that all of the hoses and connectors are securely connected. Hoses and connectors can become loose over time and lead to emissions problems.

– Make sure that all of the spark plugs are properly installed and firing correctly. Spark plugs can become fouled over time and lead to emissions problems.


If your car is experiencing problems, one of the first things you should do is check the engine light. Sometimes, a simple problem like an errant wire can cause the Check Engine Light to come on. If this is the case, you will need to take your car into a mechanic for a diagnosis and possible repair. However, if the engine light does not turn on when you try to start your car and there are no obvious signs of mechanical issues, then it may be time to have your car tested for smog emissions. A smog test uses a device that measures harmful gases in the air around your vehicle. If there are any problems with your vehicle’s emissions control system, having this test performed can help you to address them before they become bigger problems down the road.

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