Skip the auto shop - Our mechanics make house calls

Q: Check engine light appears and disappears

asked by on

check engine light appears and disappears computer reads oxygen sensor

My car has 100000 miles.
My car has an automatic transmission.

Sometimes when a check engine light comes on it will set a code in the computer and if after a set time limit the problem does not repeat the computer can turn off the light and go back to normal operation. The code will still be in memory so diagnostics can be done on the failing circuit. This is an intermittent problem and a problem may not be found at the time of testing. The code should be noted and cleared to see if it returns.

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
  1. Home
  2. Questions
  3. Check engine light appears and disappears

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: Car failing smog check

Hi there. If your car is not passing smog due to the monitors not being ready, that means the vehicle needs to be driven until the monitors are completed. The OBDII monitors are a self performed test that the vehicle's...

Q: I am looking for an oxygen sensor for my 2004 Honda CRV

Hi there. Your vehicle has several oxygen sensors that are used for the engine to run properly. I would need to know what codes are coming up to know which one of the sensors it may be. I would usually...

Q: How many o2 sensors

Your vehicle will have two oxygen sensors. Both of them are located on the exhaust manifold. One of them will be located before the catalytic converter, and is typically located rather close to the engine. This is the hardest one...

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...
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...
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.