What is an accelerator pedal position sensor replacement?

For this service, your mechanic will inspect the accelerator pedal position sensor to verify it is no longer working and replace it with a functional one.
Newer car engines control the amount of fuel sent to the engine through the use of electronics. The electronics calculate the right amount of fuel based on the movement of the accelerator pedal.
The accelerator pedal position sensor is mounted to the car’s gas pedal and converts any movements into voltage. This tells the car’s computer how much fuel needs to be injected into the engine for acceleration.

How to replace an accelerator pedal position sensor

A mechanic will typically follow these steps to replace an accelerator pedal position sensor:
  • Check the car’s computer for error codes
  • Confirm accelerator pedal position sensor needs to be replaced
  • Remove throttle trim cover to access the sensor
  • Disconnect and remove faulty accelerator pedal position sensor from the firewall
  • Install new accelerator pedal position sensor and connect it to the firewall
  • Start the engine and test new sensor for proper operation
  • Replace throttle trim cover
  • Test drive the car to make sure sensor is working and car can accelerate
Checking the accelerator pedal position sensor requires a voltmeter, and the mechanic should have a good understanding of the proper range for voltage output.

When do I need to replace my accelerator pedal position sensor?

If your car has little to no acceleration, limited power, or zero throttle response while in Neutral or Park, you should take your car to a mechanic to see if the accelerator pedal position sensor needs to be replaced.
There is not a set replacement period for accelerator pedal positions sensors, so if you have a feeling there is a problem you should take your car in for an inspection.
Your car will still run limitedly if the sensor is faulty, but you should have the sensor replaced immediately.

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