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Transmission Fault Warning:
P171E and P171F indicate incorrect or missing speed data from Input Shaft Speed Sensor 2. This directly affects Multitronic ratio control and can lead to limp mode or loss of drive.
What Do Audi Fault Codes P171E & P171F Mean?
On Audi Multitronic (CVT) transmissions, fault codes P171E and P171F relate to Transmission Input Shaft Speed Sensor 2. The control unit detects either no signal or an implausible signal compared to other speed sensors within the gearbox.
Common Causes
- Failed input shaft speed sensor 2
- Internal wiring faults inside the Multitronic gearbox
- Sensor signal interference or short to ground
- TCU (Transmission Control Unit) processing error
- Fluid contamination affecting sensor readings
Typical Symptoms
- PRNDS flashing or gearbox warning displayed
- Limp mode or restricted performance
- Jerky pull-away or hesitation
- Loss of drive when hot or under load
- P171E / P171F stored in fault memory
Our Audi Multitronic Repair Approach
Multitronic gearboxes are often replaced unnecessarily due to speed sensor faults. We carry out live data comparison, signal plausibility checks, wiring integrity testing, and TCU diagnostics before any major repair decisions. In many cases, the fault can be resolved without replacing the gearbox.