Engine Warning Light – Common Causes and Solutions

For any vehicle owner or driver, the check engine light activation is a dreadful feeling, especially when the car is running.


Common Causes of The Engine Warning Light Turning On

There may be many reasons why your car’s check engine light is on. Here are some of them.

1. Loose Fuel Cap

  • A common reason why the check engine warning light is displayed is that the fuel cap is loose or open.
  • Incorrect air pressure within the fuel tank may trigger the engine warning light on.
  • If the fuel cap is loose, ensure that you close it tightly.
  • In case the cap is damaged, or the rubber has worn off, it is time for a replacement.

2. Faulty Oxygen Sensor

  • The role of an oxygen sensor is to measure the levels of unburned oxygen in the car’s exhaust.
  • The data is sent to the electronic control unit (ECU), which then regulates the ratio of fuel and air in the engine.
  • In case of a faulty or failed sensor, the vehicle could burn more fuel than normal.
  • A defective or damaged O2 sensor could damage other components of the vehicle as well.
  • For this reason, the engine warning light turns on if there is a problem with the oxygen sensor.
  • A solution to this issue would be to get the faulty O2 sensor replaced by a new one.
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