Q: Do I need to replace the O2 oxygen sensor?

asked by on

I have an appointment on Monday, 10/3 to have my car serviced. A mechanic came to my house last week, and did an evaluation and determined the vehicle to need transmission fluid service, the oil serviced, replacement of the front and back engine mounts, and replacement the battery. He said all these things needed to be done ASAP. The earliest appointment I could book was the following week on a Thursday (which was today), and my mechanic pushed the appointment forward to Monday of next week. Today, my car was not getting power. I could turn it on, and I could eventually get it up to 20 miles per hour, but the rpms were going up really high. It was the same issue a couple of months ago, when I had the car serviced at the dealer. They replaced part of the fuel pump, and said I might need an 02 sensor, but got the car running ok. Now, I'm having the same issue.

My car has 160000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. The O2 sensor is responsible for monitoring the exhaust gases (specifically oxygen content) coming out of the exhaust to determine if there needs to be any fuel adjustments to the engine during operation. When this is not working correctly, this can cause the car to have intermittent power problems which will also cause a fluctuation in RPMs as well.

This issue can also be caused by a vacuum leak, a faulty throttle position sensor or a faulty mass air flow sensor.

When the technician from YourMechanic comes to your home or office, they can also use their scanner to download codes from your car computer to further inspect the issue.

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. Do I need to replace the O2 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: fuel sending unit

Either the dash gauge, the sending unit, or the wiring (the circuit) has a fault. To get the precise issue(s) pinpointed and repaired, the recommended service is a fuel level system diagnostic. If you request that service, the responding certified...

Q: Clutch

This may suggest the transmission synchros may be wearing out. Your transmission has small gear synchronizer rings that help to move the transmission in and out of the various gears. When these begin to wear out, you may notice it...

Q: My check engine light is on it is saying catalytic system bank 1 is below threshold. What does that mean and do I have to change t

The check engine light comes on when the Electronic Control Unit detects a fault that will effect the cars exhaust emissions. Your car has an O2 sensor upstream and downstream of the catalytic converter to monitor its performance. When the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.