P1351 — Mercedes-Benz — Injection Sensor Circuit

P1351 (Mercedes-Benz): Injection Sensor Circuit — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Injection Sensor Circuit. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Engine misfire symptoms
  • Noticeable loss of engine power
  • Increased fuel consumption
  • Check Engine light illumination
  • Rough idle during operation

Possible causes

  • Faulty injection timing sensor
  • Damaged or corroded wiring in the sensor circuit
  • Poor electrical connection at the sensor plug
  • Internal failure of the Engine Control Module
  • Short circuit to ground in the sensor harness

What to check

  • Inspect the wiring harness for signs of damage or heat exposure
  • Test the injection sensor connector for proper electrical continuity
  • Measure the resistance across the sensor terminals using a multimeter
  • Verify the ground and supply voltage at the sensor connector
  • Examine the engine control module pins for corrosion or bent terminals