Skip the auto shop - Our mechanics make house calls

Q: Do I need to replace the lower O2 sensor or upper O2 sensor?

asked by on

Hi I guess you mentioned the lower o2 sensor is bad. is that correct. In fact I changed the upper o2 sensor couple of years ago.

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: I have a bad throttle body, so instead of paying the dealership ridiculous prices, I order a throttle body myself.

After you replace the throttle body then all you have to do is turn ignition on with all accessories off. After 29 seconds of not touching anything the engine computer will relearn the new throttle body. Leave it on for...

Q: why is all of a sudden the power steering keeps leaking after being fixed? it happening again (4th time) causing PS failure.

Hi there. Have any other leaks been identified? Has the same part failed? If the hose is repeatedly failing, I would suggest using a factory part. Were the o rings/gaskets replaced that pertain to the hose? Has the steering system...

Q: Check engine, traction off lights are showing

The Check Engine Light is likely still on due to the oxygen sensor faults. The unfortunate thing is that engine computers sometimes cannot detect another problem if they are dealing with one already. That may be why it didn't have...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.