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・Fair and transparent pricing

Get a quote

What others are asking

Q: Mercedes Benz Service B

The service reminder system is not simply a mileage counter anymore. It is a computer integrated into the car's other systems that takes into account such factors as temperature, speed, how long your trips are, and whether you do more...

Q: Transmission making clunking and banging noises - 2005 Chevrolet Avalanche 2500 V8 Automatic

Check for problem codes - you mention that the Check Engine Light is on. This could be the torque convertor clutch not releasing as you slow down, or not locking up smoothly when you reach 40-50 mph accelerating. And yes,...

Q: Plastic intake manifold on the North Star engine.

Hi there. The 1993 Northstar intake is made of magnesium, and has a different system for "blowout" or backfiring protection. It has been used by some folks who have had bad experiences with the "plastic" intake manifolds. There will be...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.