Skip to content

Buick Check Engine Light: Causes & Fixes (Complete Guide)

  • by
  • 4 min read

Last Updated on: 7th September 2023, 12:46 am

When the check engine light illuminates on your Buick’s dashboard, it can be a cause for concern.

This warning light is designed to alert you to potential issues with your vehicle’s engine and emissions system, and it is important to address any problems as soon as possible.

In this article, we will explore what the Buick check engine light means, common causes of this light coming on, and how to troubleshoot and fix the problem.

What Does the Buick Check Engine Light Mean?

The check engine light, also known as the “service engine soon” light, is a generic warning light that is used by all automakers.

When this light comes on, it indicates that the vehicle’s onboard diagnostic system has detected a fault with one or more of the vehicle’s systems.

The specific meaning of the check engine light will depend on the fault code stored in the vehicle’s diagnostic system.

These codes can be read using a diagnostic tool (such as this one on Amazon), which can help to pinpoint the exact problem with the vehicle.

check engine light on car dashboard

Common Causes of a Buick Check Engine Light

There are many potential causes of a Buick check engine light, including the following.

  • Faulty oxygen sensor
  • Bad catalytic converter
  • Loose / damaged fuel cap
  • Spark plugs
  • MAF sensor

1. Faulty Oxygen Sensor

The oxygen sensor is responsible for measuring the amount of oxygen in the exhaust gas and sending this information to the engine control unit.

If the sensor is faulty, it can cause the check engine light to come on.

2. Malfunctioning Catalytic Converter

The catalytic converter is an important part of the vehicle’s emissions system, and it is responsible for reducing the amount of harmful pollutants released into the environment.

If the catalytic converter is not functioning properly, it can cause the check engine light to come on.

3. Loose or Damaged Fuel Cap

A loose or damaged fuel cap can allow fuel to evaporate, which can trigger the check engine light.

4. Failed Spark Plugs

Spark plugs are responsible for igniting the air/fuel mixture in the engine, and if they are not functioning properly, it can cause the check engine light to come on.

5. Failed Mass Air Flow Sensor

The mass air flow sensor is responsible for measuring the amount of air entering the engine, and if it is not functioning properly, it can cause the check engine light to come on.

How to Troubleshoot and Fix a Buick Check Engine Light

If the check engine light comes on in your Buick, the first thing you should do is check to see if there are any obvious problems with the vehicle.

For example, you may have left the fuel cap loose or there may be a problem with the oxygen sensor.

If you cannot find any obvious problems, the next step is to have the vehicle’s diagnostic system scanned for fault codes.

This can be done at a dealership or at a repair shop that has the necessary diagnostic equipment. Or you could use an OBD scanner.

Once the fault codes have been read, it will be easier to determine the specific problem with the vehicle and take the necessary steps to fix it.

In some cases, the problem may be something simple that can be fixed easily, such as a loose fuel cap. In other cases, it may be something more serious that requires more extensive repairs.

In any case, it is important to address the problem as soon as possible to avoid potential damage to the vehicle’s engine and emissions system.

Ignoring a check engine light can lead to more serious problems down the road, and it can also affect the performance and fuel efficiency of the vehicle.

  • Andy Lewin

    Andy Lewin is a senior mechanic, ASE qualified master technician, and an experienced automotive engineer.He's passionate about serving the automotive community with the highest-quality and trustworthy information on all things automotive. He loves to write about car repairs, maintenance, car modifications and tuning, faults, and much more.

Share this article
Available for Amazon Prime