Skip the auto shop - Our mechanics make house calls

Q: Check Engine Light O2 sensor slow

asked by on

My car has 110,500 km on it, and it accelerates slower than usual lately. I replaced the MAF about 2 months ago, then I disconnected and reconnected the battery. Now it runs much faster, but it only lasted for 2 weeks. I tried resetting the ECU and it didn’t help. Then the Check Engine light came on. So I took it to the repair shop and they said the O2 sensor is on the blink. I didn’t replace it yet. I just disconnected and reconnected the battery and that cleared CEL light. Now the car runs faster again. Will the car run faster if I put in a new O2 sensor? Will I have to keep disconnecting and reconnecting the battery every 2 weeks? Or will the new O2 sensor fix those problems? Thanks.

A: Hello. The computer reset only puts the com...

Hello. The computer reset only puts the computer in a position that it will control the fuel as if you just bought the car. As the vehicle is driven and a defective O2 sensor gives a bad input to the computer, the computer will slowly start to adjust the fuel by its input and then get to a level that it cannot compensate anymore. It will then turn on the Check Engine Light and may reduce power. Have the defective sensor replaced and clear the codes again.

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: Lowering my car

Lowering your car impacts numerous functional areas of your suspension (amount of flexibility when driving over a bump), steering (reducing the steering angle available, or interference of the tire with bodywork), brakes, suspension alignment (and tire life!), reduced ground clearance...

Q: Car will not move after driving for 2 minutes

Hi there. From the description you have provided, there appears to be a problem with your vehicle's transmission. Your vehicle's lack of acceleration (engine revs without motion after 2 minutes) could be the transmission's fluid level being low. A low...

Q: Engine makes weird noise

The knocking noise and the dying are most likely two different problems. Diagnosing sounds is inherently not possible without being present. Even with a video. There are some very specific noises a car can make that with experience a technician...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...