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!
  1. Home
  2. Questions
  3. Do I need to replace the lower O2 sensor or upper O2 sensor?

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: Are Monte Carlo 2004 - 2007 parts hard to find?

You should not have many problems finding replacement parts for this car. It will depend on the parts needed and supply and demand as with any car part. If you are more specific on the part you are looking for...

Q: Hear clicking sound when air conditioner is on

The clicking noise is most likely being emitted by one of the actuators that control the ducts in your air conditioning system. When they go bad they often make the clicking noise you are referring to. Depending on where the...

Q: My car won't stay on unless I keep my foot on the gas

Hi There, It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate. The idle air control valve is a small valve on the engine's intake system that reads the air...

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...
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 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.