Soot Particulate Sensor Malfunction – Mercedes W177

System: Emissions System
Component: Soot Particulate Sensor
Part Reference: A000 905 05 08
Model: Mercedes A-Class W177

Fault Codes

• P3005E7 – Soot particulate sensor has a malfunction

Typical Symptoms‍ ‍

• Engine warning light illuminated
  • Emissions system warning
  • Possible DPF-related fault messages
  • In some cases reduced engine performance

Possible Cause

• Faulty soot particulate sensor
• Sensor signal implausible
• Internal sensor failure
• Wiring or connector issue

Component Location

The soot particulate sensor is typically located in the exhaust system near the diesel particulate filter (DPF).

Diagnostic Insight

The soot particulate sensor monitors the amount of soot in the exhaust system and helps the engine control unit manage DPF regeneration.

If the sensor fails or provides incorrect readings, the engine control unit cannot accurately determine soot levels, which may trigger the engine warning light.

Technicians usually check:

• sensor readings using diagnostic live data
• wiring and connector condition
• DPF system operation

If the signal remains implausible, replacement of the soot particulate sensor is typically required.

In this case, replacing the sensor A000 905 05 08 resolved the fault and cleared the warning light.

Soot Particulate Sensor - A000 905 05 08

⚠ Professional Diagnostic Recommended

Modern Mercedes-Benz emissions systems require specialist diagnostic equipment. The vehicle should be inspected by a Mercedes-Benz dealer or qualified Mercedes specialist.