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P3835

DEF Tank Level Sensor Malfunction

2009-2013 Audi A3 2.0L TDI

Moderate SeverityPowertrainGeneric (SAE)

Description

The DEF tank level sensor is reporting incorrect or no reading.

Symptoms

  • DEF level gauge inaccurate
  • False low DEF warning
  • Cannot determine DEF level
  • Potential unnecessary derate warning
  • Service message for DEF

Common Causes

  • Level sensor float stuck
  • Sensor wiring corrosion
  • Crystallized DEF on sensor
  • Tank sender unit failure
  • Short circuit in sensor

Diagnostic Steps

  1. Read DEF level PID and compare to actual
  2. Inspect DEF tank sender unit
  3. Check sensor wiring for corrosion
  4. Test sensor resistance range
  5. Add known quantity of DEF and check reading

Repair Notes

Replace DEF tank level sender unit. Clean DEF tank if crystallization is present.

Related Codes

P3830SCR System Efficiency Below ThresholdP3834DEF Supply Pump Pressure Low

Other Powertrain Codes

P3835 on Other Vehicles

Common Questions

What does code P3835 mean on a 2009-2013 Audi A3?

P3835 stands for "DEF Tank Level Sensor Malfunction". The DEF tank level sensor is reporting incorrect or no reading.

What are the symptoms of P3835 on a Audi A3?

Common symptoms of P3835 include: DEF level gauge inaccurate, False low DEF warning, Cannot determine DEF level, Potential unnecessary derate warning, Service message for DEF.

What causes P3835 on a 2009-2013 Audi A3?

Common causes of P3835 include: Level sensor float stuck, Sensor wiring corrosion, Crystallized DEF on sensor, Tank sender unit failure, Short circuit in sensor.

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