Skip the auto shop - Our mechanics make house calls

Q: Loses power when reaches a certain speed limit sometimes it works sometimes it doesn't when it works cruise control works

asked by on

I put the code tester up and it told me my O2 sensor was bad is that the cause I don't really know what causes my car to work when it does work but when it doesn't it loses power at 35 and it will put then it will go back to the 35 and does it again sometimes it does it at 45 mph as well

My car has 142000 miles.
My car has an automatic transmission.

A: Hey there. This may likely be related to a ...

Hey there. This may likely be related to a bad O2 sensor. As you may know, the O2 sensor monitors the oxygen content of the exhaust gases as they leave the catalytic converter to determine how much additional fuel to add or subtract to the air/fuel mixture. When this sensor is not working properly, you may experience poor running conditions as a result of the car being over or under fueled depending on the circumstances. This may cause the car to starve for fuel or be flooded with too much fuel. I would recommend having an expert from YourMechanic come to your home to take a look at your car to properly diagnose the loss of power and move forward with repairs.

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Keyless synchronization, how much is cost? Change lock from door? 2006 Pontiac Grand Prix

Hello - there will be 2 tasks here. The first is to match the door lock(s) with the ignition switch key tumbler if you wish for one key to do everything as a new car would. This can be done...

Q: Motor mount need fix

Hi there. It sounds like it could be a motor mount, but this more than likely needs a thorough inspection to determine which and how many mounts are in need of replacement. The inspection may uncover any other possible underlying...

Q: Whine noise only, in cabin at 2000 rpms

Hi there. It appears you're chasing a lot of potential mechanical or electrical gremlins with your 1993 Honda Accord; which is rather typical with a car more than 20 years old. There could be multiple issues that are causing these...

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...
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...
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.