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.

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?
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. When I press the gas pedal the vehicle misfires

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: Q: Fuel pump problem

Hello. Code P0089 is the code for an issue withe the vehicle's fuel pressure regulator. In this instance it appears that the code refers the fuel pressure regulator mounted in the engine bay, on the vehicle's high pressure fuel pump....

Q: Car stopped moving suddenly, gears stuck

Hello there. This type of fault is not uncommon. There are a few different faults that would cause this on your 2000 Cadillac Catera, but since the engine runs properly the fault most likely lies with the transmission in some...

Q: My car shows a misfire on cylinder 2

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark-related...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...