Audi S4 Vehicle Speed Sensor in US

The vehicle speed sensor on the Audi S4 is a single component whose data feeds multiple vehicle systems at once on your S4. When it fails on the Audi S4, the effects appear across your S4 speedometer, transmission, cruise control, and ABS simultaneously, making diagnosis less straightforward than a fault that affects only one system on the Audi S4.

Signs of a Failing Vehicle Speed Sensor on the Audi S4

• Speedometer on your Audi S4 reading zero, displaying erratically, or showing an inaccurate speed
• Harsh, erratic, or delayed transmission shifting on the S4, the TCM uses speed data to determine shift points
• Cruise control on your Audi S4 refuses to engage or cuts out unexpectedly during use
• ABS or traction control warning lights illuminated on the S4 dashboard
• Check engine light on your Audi S4 with stored codes P0500, P0501, or P0502
• S4 transmission entering limp mode, locking into a single gear to prevent damage

Transmission-Mounted vs. Wheel-Mounted Speed Sensors on the Audi S4

On older Audi S4 vehicles and most rear-wheel-drive designs, a dedicated transmission-mounted speed sensor monitors output shaft speed on the S4 and serves as the primary reference for the S4 speedometer and transmission control module. On modern Audi S4 front-wheel-drive and all-wheel-drive platforms, wheel hub sensors serve the dual function of ABS speed sensing and vehicle speed data delivery on the S4, one sensor feeding multiple Audi S4 systems from a single mounting point.

Why GeoBrakes for the Audi S4 Vehicle Speed Sensor

Signal accuracy is the defining specification for a Audi S4 vehicle speed sensor. A sensor that generates the wrong pulse frequency for your S4 control modules produces incorrect speedometer readings, mis-timed transmission shifts, and inaccurate ABS calibration on your Audi S4, even if it passes a basic resistance test. Every speed sensor in the GeoBrakes catalogue is sourced to the correct signal frequency for the Audi S4 exact year, make, model, and sensor position.

Frequently Asked Questions - Audi S4 Vehicle Speed Sensor

Can a faulty speed sensor affect the transmission on my Audi S4?

Yes. The Audi S4 transmission control module relies on vehicle speed data to calculate correct shift timing. A failed S4 speed sensor can cause erratic shifting, delayed upshifts, incorrect downshifts, or trigger S4 limp mode.

Will a bad vehicle speed sensor turn on the check engine light on my Audi S4?

Yes. A failed Audi S4 vehicle speed sensor typically stores fault codes P0500, P0501, or P0502. Depending on the S4, it may also trigger ABS, traction control, or transmission warning lights simultaneously.

Is the vehicle speed sensor the same as the ABS wheel speed sensor on my Audi S4?

On many modern Audi S4 vehicles, yes, wheel hub sensors serve both the ABS system and vehicle speed sensing simultaneously on your S4. On older S4 vehicles with transmission-mounted speed sensors, they are separate components. Use the GeoBrakes vehicle selector to confirm the correct sensor type for your Audi S4.