Skip the auto shop - Our mechanics make house calls

Q: Had a computer check done and the scanner said to replace the Oxygen sensor.

asked by on

when driving how do i know oxygen sensor needs to be changed.had a computer check done .and it was told sensor was bad.when driving how do i know sensor is bad?

My car has 130000 miles.
My car has an automatic transmission.

Hi there. The oxygen (O2) sensors have two functions, read the emissions and preheat the tip for measuring. Usually the tip will no longer preheat up causing the sensors to not register the emissions. Other times the O2 sensors tend to get full of soot and not register the emissions. The only thing that you will notice when this happens is the vehicle will being to run rich and go through fuel faster than normal. Also, the tail pipe emissions will begin to stink and smell like unburnt fuel. The engine will begin to have hard starts and may not shut off properly. If you need further assistance with the O2 sensors, then seek out a professional, such as one from Your Mechanic, to help you.

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!
  • Home
  • Questions
  • Had a computer check done and the scanner said to replace the Oxygen 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: Able to get my trunk open, by crawling through the back, but the trunk release button (hold unlock button on door) still won't ope

Hello, and thank you for writing in. The first thing we need to determine is if there an issue with the latch, the switch, the key fob, or possibly the wiring. The best way to determine this is to test...

Q: RPMs erratic during idling, Check Engine Light on, P0174 code

Hello. The P0174 code deals with the truck running lean. That means that the PCM is restricting fuel to the injectors. This is usually caused by a vacuum leak in the engine. There could be a leaking intake gasket, or...

Q: Clicking sound coming from left front driver side wheel not just turning but going straight increases with speed 2007 dodge grand

Hi There, It sounds like you may have a worn or failing CV joint that. A CV (Constant Velocity) joint is a shaft that connects the transmission to the wheels, essentially transferring the power from the drive train directly to...

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...
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.