Sender. Vehicle Speed Sensor.
A Sensor, located on a Vehicle's transmission / transaxle and not a part of the ABS system, used to measure transmission / transaxle output or wheel Speed. Location-Transmission Case. Transmission Speed Sensor.

Vehicle Speed Sensor

Fits A4 (1996 - 2006)

Vehicle Speed Sensor - Repair or Replace
Your vehicle speed sensor sends information to your speedometer and/or your engine’s computer to tell the transmission when to shift. If the speedometer in your Audi A4 isn’t working, or there’s a check engine light that accompanies shifting problems, let a Audi technician examine your vehicle.