Why Is My Check Engine Light On?

Posted: 1/15/19 | By: Ruben Crow

Check Engine Light
Check Engine Light

What Is It?

The check engine light is your cars way of telling there is a problem with one of it's systems. If your check engine light is on you should have your car looked at as soon as possible. It could be something as simple as a  loose vacuum hose or a fuel cap or something more serious and costly. 

 How It Works

 When the vehicle's engine control computer or ECU  finds a problem it cannot correct, the computer turns on a yellow warning indicator on the dash and stores a trouble code in it's memory.  These codes can be retrieved by a mechanic with a special scan tool. 

 If the light is steady. The problem is not an emergency, but you should schedule an appointment as soon as possible.   

 A blinking light usually indicates a more severe engine problem and requires immediate attention. 

 According to CarMD the most common repairs required when the check engine light comes on are:  

  1.  Replace Oxygen Sensor(s)  
  2. Replace Ignition Coil(s) and Spark Plugs  
  3. Replace Catalytic Converter(s)  
  4. Inspect for Loose Fuel Cap and Tighten or Replace as Necessary  
  5. Replace Evaporative Emissions (EVAP) Purge Control Valve.