Q: Oxygen sensor problem

asked by on

I recently paid $80 for a check engine light inspection from one of your mechanics he basically told me what the technicians at auto zone told me which was that the problem is with the variable valve timing solenoid he checked my solenoids and said they were fine. He also recommended that i get a new cat converter too but he said i would still be able to pass a smog. So i go for a smog check today and i dont pass they tell me i need an oxygen sensor and they bring up my check engine light code. Could it be the oxygen sensor causing my check engine light to be on ?

My car has 106100 miles.
My car has an automatic transmission.

Hi There, Yes, your oxygen sensor (among many other things) will absolutely cause the check engine light to come on. The oxygen sensors which are part of your emissions system read exhaust gases to determine whether or not the appropriate amount of oxygen is present in the exhaust. Based upon this reading, this information is relayed to the car’s ECU which then makes a determination as to whether or not to add more or less fuel to the engine. When too much or too little oxygen is present, this will cause check engine light to come on. Too much oxygen may be present in the exhaust gas due to things like an exhaust leak, a vacuum leak, a faulty mass air flow sensor (causing a lean fuel condition) or faulty fuel injectors. Too little oxygen may be present in the exhaust gas may be caused by things like a clogged air filter, a failing mass air flow sensor (causing too much fuel to be introduced to the motor), bad fuel injectors or a clogged catalytic converter. When the O2 sensor is not working properly, this will cause false readings to be relayed to the computer causing inaccurate adjustments to be made to the intake and fuel system in your engine. I would suggest having an expert from Your Mechanic come to your home to diagnose your emissions system.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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. Oxygen sensor problem

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: Why does my #1 spark plug continue to burn up in my 2008 Ford F-150

Hello. If you continue to have the spark plug end burn up on just that cylinder then there is an issue with the mixture in that cylinder. It can be caused by a compression problem, carbon build up, or it...

Q: Needing to find the problem on my daughter's 05 350Z Desi it does not blow air or anything her dad already tried putting the freon

Hi...I can help you with these issues. If the a/c system is leaking, the leak should be pinpointed by a mechanic to estimate the repair cost. If the leak is at an o-ring (a 50 cent item, plus labor), the...

Q: Buying a car with an emtpy radiator

I would not advise any vehicle gets purchased without a pre purchase inspection like one from YourMechanic. This way you would know if the vehicle has an engine head gasket or other coolant leak.

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...