Q: My check engine light came on, changed O2 sensor. Check engine light was still on, then three days later went off.

asked by on

My check engine light came on and was solid, not blinking, my mechanic reset my sensors, but it didn't help. Took my car to an exhaust place, they said it was my O2 sensor or my catalytic converter. I had them change my sensor, drove 10 miles and my check engine light came back on, so I figured it was the catalytic converter. Three days after that, the check engine light turned off. I called the exhaust place and they said it was ok to continue driving. How do I know for sure what is going on with my car?

My car has 148377 miles.
My car has an automatic transmission.

Hi There, The last diagnosis is correct in that the sensor replaced caused the check engine light to turn off. In some cases they do not always turn off immediately and take a bit of driving for the computer to recalibrate and recognize that the problem has been corrected. In your case, it sounds like the oxygen sensor is what caused the code to be triggered. This can also sometimes cause codes to be triggered that may reflect problems with the catalytic converter as well since the oxygen sensor reads the exhaust gases coming from the catalytic converter.

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. My check engine light came on, changed O2 sensor. Check engine light was still on, then three days later went off.

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: Q: Shifting problem

What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...

Q: Q: Burning oil?

Hi there. It sounds like your car has an oil issue. It sounds like it can be a combination of issues. I would usually get the vehicle in the air to check for leaks first. If it was just burning...

Q: Rear wheel won't move

With the wheel locked up this car is unsafe to drive until the problem is fixed. With that said, the most common issue would be a wheel bearing that has seized, or a parking brake that is stuck engaged. With...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.