How to Check Engine Light on Car

Introduction

The check engine light (CEL) is a warning light that illuminates on your car’s dashboard when there is a problem with the engine or its emissions control system. It is important to check the CEL as soon as possible to avoid further damage to your car.

Step 1: Safety First

Before you start working on your car, it is important to take some safety precautions:

• Park your car on a flat, stable surface.
• Engage the parking brake.
• Turn off the engine and allow it to cool down.
• Wear gloves and safety glasses.

Step 2: Locate the Check Engine Light

The CEL is typically located on the dashboard, either in the center or on the right side. It is usually a yellow or orange light with the words “Check Engine” or “Service Engine Soon” written next to it.

Step 3: Determine the Code

Once you have located the CEL, you need to determine the code that is causing it to illuminate. There are two ways to do this:

• OBD-II scan tool: This is a handheld device that you can plug into your car’s diagnostic port to read the trouble codes stored in the engine’s computer.
• Code reader app: There are several mobile apps available that allow you to read trouble codes using your smartphone or tablet. You will need an OBD-II adapter to use these apps.

Step 4: Decode the Code

Once you have the code, you need to decode it to determine what the problem is. There are several online resources that you can use to decode trouble codes, such as:

• OBD-II Code Lookup
• AutoZone OBD-II Code Definitions

Step 5: Diagnose the Problem

Once you have decoded the code, you can start diagnosing the problem. This may involve checking the following:

• Spark plugs
• Ignition coils
• Fuel injectors
• Oxygen sensors
• Exhaust system
• Catalytic converter

Step 6: Repair the Problem

Once you have diagnosed the problem, you can repair it. This may involve replacing faulty parts, cleaning sensors, or adjusting settings. It is important to follow the manufacturer’s instructions when repairing your car.

Step 7: Reset the Check Engine Light

Once you have repaired the problem, you need to reset the CEL. This can be done using an OBD-II scan tool or a code reader app. Simply clear the codes from the engine’s computer and the CEL should turn off the next time you start your car.

Conclusion

Checking the check engine light is an important part of maintaining your car. By following these steps, you can diagnose the problem and make the necessary repairs to keep your car running smoothly.