Skip the auto shop - Our mechanics make house calls

Q: When I press the gas pedal the vehicle misfires

asked by on

i connect launch scanner it show p1128

My car has 85654 miles.
My car has an automatic transmission.

A: The code P1128 means that the heated oxygen...

The code P1128 means that the heated oxygen is swapped from the circuitry. Check the wiring on the O2 sensor and check the condition of the O2 sensor. If the sensor is working fine or you have replaced the sensor and the code still comes on, then there could be a problem with the mass air flow (MAF) sensor or a vacuum leak.

First, look for any vacuum leaks. Check all of the hoses that are connected to the intake manifold and see if there are any vacuum leaks. If there is a vacuum leak, then fix the leak and check if the code comes on. If there is no vacuum leak, then check the MAF sensor for any corrosion or debris. Remove the MAF sensor and clean it. Once it is cleaned, put the MAF sensor back on and retest. If the code comes back, then the MAF sensor is malfunctioning. If you need further assistance with your engine, then seek out a professional, such as one from YourMechanic, that can help you with the gas pedal issue.

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: Minimum Oil Level indicator light shows up every month

Hi there. You are right that this engine does have a history of high oil consumption. This is caused by the design of the engine and the turbo. With that being said, you adding a little more I would consider...

Q: the check engine light appears and it gives us the code P0170

The P0170 trouble code does not necessarily go with your vehicle, but it indicates fuel control problems. I recommend the following: Have the fuel pressure tested to see if it is too low or high. Make sure...

Q: Car spits an sputters like it's misfiring if I accelerate too fast. But does fine any other time

Hey there. The first thing I would check would be the fuel pressure. But there are several possible causes for this condition. There could be a vacuum leak, the engine may need a tune up, or any number of other...

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.