Skip the auto shop - Our mechanics make house calls

Q: Need help with a reduced engine power warning light.

asked by on

Came on about 3 weeks ago off and on. I checked sensors and everything. The codes read it was an accelerator peddle and a throttle position sensor. Took it in to get tested and was told my throttle body was going bad so I changed that. But still in the morning the light comes on. I was told it could be the accerator peddle going bad or spark plugs. Do you have any advice on what it could be?

My car has 186915 miles.
My car has an automatic transmission.

A: Hello. If the trouble codes for the throttl...

Hello. If the trouble codes for the throttle position sensor and accelerator pedal came on then those two sensors are the first things I would check. For this vehicle, the throttle position sensor is built into the throttle body.

If after replacing the unit the code remains, then it may be possible that there is an issue with the wiring or connector. It may also be possible that the accelerator pedal position sensor is bad. The sensor is located at the base of the accelerator pedal, and as it’s name implies, measure pedal position so that the computer knows how wide to open the electronic throttle body.

If it goes bad it can set off the warning light as well as cause performance issues. In more serious cases it’s failure may even render the vehicle undrivable. If you are unsure, I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose the cause of the warning lights so that this can be repaired properly.

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

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: What does it cost to replace the front end?

The cost of this repair would depend on the exact parts that require replacement. There are multiple parts on the front of the vehicle including suspension parts and brake Parts. Depending on which parts have failed you may need to...

Q: Hey so I have a 2011 Chevy Malibu I'm replacing the throttle body because the throttle body injector stopped working. Do I have to

It is always recommended to replace the sealing O ring or gasket under a throttle body when removing or replacing it. If not then a vacuum leak can develop causing driveability symptoms and check engine light to come on. ...

Q: Driver side door will not open from the outside

You probably just need a new door handle. The business end of the door handle is made of plastic or cheap metal and eventually it breaks off inside the door. Most door handles can be replaced from outside the car...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...