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?
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 illuminted

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 vibrates/shakes when sitting still in idle (in gear or in neutral).

This sounds as if you have a low idle condition. I can say your car isn't likely to suffer a catastrophic failure because of this. With a condition such as this, it is normal for it to run rougher when...

Q: A/C control messed up.

The system is controlled electronically and consequently the controller is a possibility. But, to condemn the controller, there is a long sequence of diagnostic steps (from the Factory Service Manual) that have to be performed. Typically, in diagnostics of this...

Q: How do I know which O2 sensor to change when it sets a code for o2 sensor? 2000 Jaguar S-type

Hi - the description for each Check Engine problem code contains the clues : for a given code - P1647 for example - the description is "Bank 2, Sensor 1". This means the first sensor in the exhaust system -...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.