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2010 AUDI A3
2.0L TDI I4•FWD•AUTOMATIC•diesel•CBEA•turbo
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor506Torque4360Fluid7DTC988Battery1Maintenance0Recalls5
P3890moderate severityPowertrain

Exhaust Pressure Control Valve Malfunction

on 2010 Audi A3 2.0L TDI I4 · FWD

What this code means

The exhaust pressure control valve (exhaust brake or back-pressure valve) has a malfunction. This valve can be used for exhaust braking and to raise exhaust temperature.

Symptoms

  • Check Engine Light
  • No exhaust braking function
  • Reduced DPF regen capability
  • Engine braking feel reduced
  • Exhaust temperature management affected

Common causes

  • Valve actuator failure
  • Carbon buildup on valve
  • Vacuum/pressure line disconnected
  • Valve position sensor fault
  • Wiring harness damage

Diagnostic steps

  1. Command exhaust brake on/off with scan tool
  2. Monitor valve position vs commanded
  3. Check actuator vacuum/pressure supply
  4. Test valve position sensor
  5. Inspect valve for carbon deposits

Repair notes

Replace exhaust pressure control valve or actuator. Clean carbon deposits from valve and housing.

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