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2009 AUDI A4
3.2L V6•AWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor506Torque3228Fluid9DTC1087Battery1Maintenance0Recalls2
P1171high severityPowertrain

Throttle Actuation Potentiometer Signal 2 Range

on 2009 Audi A4 3.2L V6 · AWD

What this code means

The ECU detected that the second throttle position potentiometer signal is outside its expected voltage range. VW/Audi throttle bodies use dual potentiometers for redundancy and safety.

Symptoms

  • Check Engine Light
  • Reduced power mode
  • Throttle response erratic
  • Engine may idle only

Common causes

  • Faulty throttle body unit
  • Damaged wiring to throttle position sensor 2
  • Corroded connector
  • Throttle body contamination affecting sensor
  • ECU fault

Diagnostic steps

  1. Read throttle position sensor 1 and 2 values with scan tool
  2. Check for proper signal tracking between both sensors
  3. Inspect throttle body connector
  4. Test wiring continuity for sensor 2
  5. Clean throttle body and retest

Repair notes

Replace the throttle body assembly if the internal potentiometer has failed.

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