Skip the auto shop - Our mechanics make house calls

Q: Check engine light flash with starting the car

asked by on

I bought a used 2013 Chevy suburban. The check engine light keeps coming on and off. I brought it to one place and they said there is no problem. The next week when the light came back on I brought it back to the dealership I bought it from. They said there was a problem with an oxygen sensor replaced it. The next week apparently another oxygen sensor had to be replaced. Now the light doesn't flash when the car turns on and I was wondering if it's supposed to

A: The Check Engine light should illuminate wh...

The Check Engine light should illuminate when you turn the key on, and then go off after the engine is started. If it comes on anytime the engine is running, the vehicle's computer has noticed an emissions related problem.

When the light comes on it also sets a Diagnostic Trouble Code (DTC) in the computer's memory to assist the technician in diagnosis. The DTC does not tell a technician what part to repair or replace, but it does provide a starting point for what system to focus on in diagnosis. If your light comes on when you turn key on, and goes off after starting the engine, your Suburban is testing its systems and is ok with the results.

If the light persists, I would recommend having the vehicle checked. If you want to have this done, a technician from YourMechanic can conduct a thorough Check Engine Light diagnosis at your home or office and let you know how to proceed with a repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: I cannot start my car after engine cools

Hi, thanks for writing in. There are several possible issues that can cause an engine to not start after it cools. The first thing we need to determine however is what starting issues are you having. If the engine doesn't...

Q: Air conditioner not working

Hello. More information will be needed to properly diagnose this. If the the system is failing to blow cold air, the system will need to be checked for proper blend door operation, compressor operation, and refrigerant pressures. A leak check...

Q: Need AC temperature actuator replaced.

Hi there, AC blowing cold from some vents while warming up in other vents may be an indication of a low refrigerant charge level. This is what is likely happening due to low refrigerant level: The air passing over the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...