Q: Q: Warning light on

asked by on

The Check Engine light is on.

Hi, the Check Engine Light turns on when the car’s computer detects a fault somewhere. While you are driving the car, the computer is constantly checking all of the signals coming from the sensors throughout the vehicle. The computer knows what the values should be at any given time and if it detects values outside of the norm, it will trip the Check Engine Light and set a DTC, or Diagnostic Trouble Code. A certified technician, such as one from YourMechanic, would be able to hook up a scan tool to the car and read the DTC to help diagnose the your Check Engine Light. While the Check Engine Light is mainly used to make sure the engine is working as efficiently as possible, it can indicate if there is damage somewhere so it should be looked at soon.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Warning light on

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: cost to replace valve lifters, is this something I can do.

In order to replace the valve lifters on the engine it requires removing the intake manifold and cylinder heads to gain access to the lifters and lifter guides. This kind of job calls for a minimum of at least 10...

Q: Car won't start after battery replaced

Engine starting on a hybrid is more complicated than a gasoline car. The starter is also the alternator and a drive motor. It is located in the bell housing in between the engine and transmission. There’s a lot more computer...

Q: The car shakes during braking and at stop lights, error code P0420

Hi there. The P0420 code you are getting can cause your car to run like this. The code typically means that the catalytic converter is failing or one of the oxygen sensors may be failing. If it was the...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.