Carleton Place Auto Repair

Common Engine Light Causes

Common Engine Light Causes

Is This Why Your Light Is On?

The service engine light coming on may be a nuisance, but it’s a simple way of letting you know that something is wrong and you need to check it out. It could indicate anything from a small part that needs to be replaced to major damage. However, these are the most common reasons your check engine light turns on.

Gas Cap

On one side of the spectrum of repairs is the gas cap. It could be loose, broken, or missing. Without proper sealing of the gas tank, fuel can evaporate, leading to more trips to the gas station and less money in your wallet. It can also allow dangerous fumes to escape into your garage when your car is parked. As far as fixes go, this is one of the simplest. Tighten the cap in place and you’re good to go!

Spark Plugs or Plug Wires

The ignition coil sends a spark to the spark plugs through wires to cause combustion. If either the plugs or the wires are faulty, other parts of your car may suffer, including the O2 sensors, ignition coils, and catalytic converter. At the worst, a catalytic converter replacement may cost you hundreds of dollars. Until then, your car will have less power and will use up more fuel.


The O2 sensor is responsible for measuring how much oxygen is in the exhaust system for the purpose of ensuring there is the right mixture of fuel and oxygen. A defect will lead to lower gas mileage and harm to other components. The mass airflow sensor gauges how much air enters the engine, and damage to this part also results in poor fuel economy and other affected areas.

Catalytic Converter

The catalytic converter is one part likely to be impacted by other parts that need replacement. It converts carbon monoxide into carbon dioxide. If it doesn’t work correctly, your car will fail emissions tests, and the engine will have problems such as stalling.

Take your check engine light seriously and act promptly. All you need to do is drive over to Macpherson Auto Center in Carlton Place, ON for professional and skilled service to get your vehicle functioning at its best again.