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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
P3892moderate severityPowertrain

Exhaust Gas Temperature Sensor Rationality - Post Aftertreatment

on 2010 Audi A3 2.0L TDI I4 · FWD

What this code means

The exhaust gas temperature sensor after the aftertreatment system shows readings that do not correlate with upstream sensors and engine operating conditions.

Symptoms

  • Check Engine Light
  • Incorrect aftertreatment temperature monitoring
  • DPF regen timing affected
  • False overtemperature warnings
  • Aftertreatment protection mode may activate incorrectly

Common causes

  • EGT sensor drift
  • Sensor contaminated with soot
  • Wiring resistance increased
  • Sensor response time degraded
  • Exhaust leak affecting sensor reading

Diagnostic steps

  1. Compare pre and post aftertreatment EGT readings
  2. Test EGT sensor response time
  3. Measure sensor resistance at known temperature
  4. Inspect sensor for soot contamination
  5. Check for exhaust leaks near sensor

Repair notes

Replace exhaust gas temperature sensor. Clean sensor bung of soot buildup. Verify temperature readings correlate after replacement.

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