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P03BD Powertrain

Cylinder 5 Pressure Sensor Circuit

A general electrical fault on the cylinder 5 combustion pressure sensor — used on engines with closed-loop combustion control (e.g. some Volvo and BMW direct-injection diesels) to measure cylinder pressure directly via a sensor at the glow plug or injector position.

Affected components

  • Cylinder pressure sensor

Common causes

  • High likelihood: Sensor failed

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • This code can affect emissions

Related codes

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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