Audi Accelerator Pedal Sensor (A4 Quattro A5 Quattro S5 S4) - Genuine Audi 8K1721523A

Product Information

An accelerator pedal sensor (also called an APP sensor) is an electronic device that monitors the position of the accelerator pedal and sends this data to the engine control module (ECM). Instead of using a mechanical throttle cable, modern vehicles rely on this sensor to regulate throttle response, fuel injection, and engine power. A properly functioning sensor ensures smooth acceleration, precise throttle control, and optimal fuel efficiency.

• Delayed or unresponsive acceleration, due to incorrect pedal position signals.
• Check Engine Light illumination, often with throttle-related diagnostic trouble codes.
• Engine hesitation, stalling, or reduced power (limp mode), caused by faulty sensor readings.

About Genuine Audi

The original parts used by Audi to build your car are available as replacement parts under the “Genuine Audi” brand. Manufactured under the direction of Audi, expect excellent quality and a premium price since these parts are available exclusively through the Audi Dealership network.

You may not realize this, but the parts that make up your Audi are not necessarily manufactured by Audi. No cause for concern, as Audi designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for Audi for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine Audi parts box and find an OEM branded part inside, simply with the addition of an Audi logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.