Check Engine Light Diagnostic San Antonio

The check engine light on your car’s dashboard is a crucial indicator that alerts you to potential issues with your vehicle's engine or related systems. When this light comes on, it’s important not to ignore it, as it can signal anything from a minor problem to a serious issue that could affect your car’s performance and safety.

Why Your Check Engine Light May Come On?

Loose or Faulty Gas Cap

One common reasons for a check engine light to illuminate is a loose or faulty gas cap. The gas cap seals the fuel system and helps maintain pressure within the fuel tank. If it's not properly secured, it can cause the fuel system to lose pressure, triggering the check engine light. Ensure the gas cap is tight and properly sealed. If the light doesn’t go off after securing the cap, consider replacing it with a new one.

Oxygen Sensor Failure

The oxygen sensor measures helps manage the engine’s fuel mixture to ensure optimal performance and efficiency. A failing oxygen sensor can lead to reduced fuel economy and increased emissions. Have the oxygen sensor checked and replaced if necessary. Driving with a faulty oxygen sensor can lead to further engine damage and reduced performance​ 

Faulty Spark Plugs or Wires

Spark plugs can wear out or become fouled, causing misfires. Faulty spark plug wires can also cause similar issues. Replace spark plugs and wires as part of regular maintenance to prevent misfires and improve engine performance.

Catalytic Converter Issues

The catalytic converter if it fails, it can cause a variety of problems, including poor engine performance and increased emissions. Have your catalytic converter inspected and replaced if necessary. Regular maintenance and timely repairs can prevent catalytic converter issues​ 

Mass Airflow Sensor Problems

A malfunctioning MAF sensor can cause poor fuel economy and performance issues. Clean or replace the MAF sensor. Ensuring your air filter is clean can also help maintain the MAF sensor's performance.

Exhaust Gas Recirculation (EGR) Valve Issues

The EGR valve if it gets clogged or fails, it can lead to performance issues and increased emissions. Clean or replace the EGR valve to restore proper engine function and emissions control.

Vacuum Leaks

Vacuum leaks can lead to a variety of engine performance issues and trigger the check engine light. Inspect the vacuum hoses for any signs of wear or damage and replace them if necessary.

Battery and Charging System Problems

A weak or failing battery can cause voltage issues similarly, problems with the alternator or other charging system components can also cause the light to come on.

Contact Kool2U Mobile Auto Repair for these and any other problems you may be having with your vehicle and we will send a certified auto repair technician to you and get to the bottom of your automotive issues!​