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2024 MERCEDES-BENZ SPRINTER VS30
2.0L I4 Diesel OM654•RWD•AUTOMATIC•diesel•OM654•turbo
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Repairs1Labor506Torque3536Fluid8DTC991Battery1Maintenance0Recalls0
P3831moderate severityPowertrain

DEF (Diesel Exhaust Fluid) Quality Sensor Malfunction

on 2024 Mercedes-Benz Sprinter VS30 2.0L I4 Diesel OM654 · RWD

What this code means

The DEF quality sensor that measures urea concentration in the DEF tank is malfunctioning.

Symptoms

  • DEF quality warning
  • Potential derate countdown
  • Check Engine Light
  • Unable to verify DEF concentration
  • Service DEF system message

Common causes

  • DEF quality sensor failure
  • Sensor contaminated by crystallized DEF
  • Sensor wiring fault
  • Sensor connector corrosion
  • Diluted or incorrect DEF affecting sensor

Diagnostic steps

  1. Read DEF quality sensor PID
  2. Test sensor with known-good DEF
  3. Inspect sensor for crystallization
  4. Check sensor wiring and connector
  5. Compare sensor reading to refractometer test

Repair notes

Replace DEF quality sensor. Clean sensor mounting area of crystallized DEF. Use only API-certified DEF.

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