Skip the auto shop - Our mechanics make house calls

Q: Check engine light illuminted

asked by on

The dashboard in my car showed check engine light on. I was told that the O2 sensor should be replaced. After having the oxygen sensor changed, the light went off. However, the following day, the check engine light went on yet again. What could be the problem? I appreciate your help.

Depending on the code received, you could either have separate problem or the O2 sensor code returned due to a misdiagnosis. The codes for O2 sensors can be from the engine running lean, rich, misfiring, or several other reasons. However, it is not caused by a problem with an O2 sensor itself. Have the computer scanned and see if the same code returns. If it does, then a proper diagnosis should be done to fix the real problem. I’d suggest getting the vehicle serviced by a qualified technician who has the tools and experience to diagnose your Check Engine Light. A proper repair can be made once the issue has been pinpointed.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: How much to change front pads and rotors on disco II?

Billing question for the cost to replace the front brake pads on a 2002 Land Rover Discovery with a V8-4.0L engine.

Q: Front left tire shakes during braking

You may have a warped rotor, this can be checked with a dial indicator to measure the runout of the suspecting rotor. If the rotor is okay then you may have an ABS problem with the wheel sensor causing the...

Q: Dead battery followed by fluttering rpms

An issue like this could very well be as simple as a dead battery. A battery that will not hold a charge, will force the alternator to keep the engine running, and some are not able to do so. The...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.