What can make your check engine light come on?

What is the most common cause of check engine light?

Replacing a faulty oxygen sensor — a sensor used to optimize a vehicle’s fuel-to-air mixture to increase gas mileage and reduce emissions — is the most common cause for a check engine light. With over 400,000 repairs nationwide, oxygen sensor replacements account for 8% of all check engine light repairs.

What would make a check engine light go on?

The light could be a minor issue, such as a faulty gas cap, or it could mean something more serious, such as a misfiring engine. … The check engine light — more formally known as the malfunction indicator lamp — is a signal from the car’s engine computer that something is wrong.

Can a check engine light come on for no reason?

Something as simple as forgetting to replace the gas cap could cause your “check engine” light to come on. … Faulty ignition – Spark plugs ignite the fuel as it flows through the engine’s cylinders. Failing to replace a spark plug could lead to catalytic converter failure or other serious problems.

How serious is check engine light?

Your Check Engine Light may be indicating a simple problem that’s easy to fix—such as a loose gas cap that needs to be replaced. … A flashing Check Engine Light indicates that your vehicle’s engine is in serious trouble, whereas a steadily lit one means less urgent service is needed.

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Where can I get my engine light checked for free?

At a local auto parts store

  • Advance Auto Parts.
  • AutoZone.
  • Napa Auto Parts.
  • O’Reilly Auto Parts.
  • Pep Boys Auto Parts.

Can needing an oil change make your engine light come on?

1. Your Car Needs an Oil Change. An illuminated check engine light is the first warning sign that your vehicle needs an oil change. It can activate because the oil is too dirty or when there’s not enough flowing throughout the engine.

Is resetting check engine light illegal?

It’s called fraudulent concealment and it is illegal. Many states will allow punitive damages. This car dealership should count themselves lucky that you discovered this problem before it caused any personal injuries.