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P01B4 Powertrain

Alternative Fuel Rail Temperature Sensor Circuit

Generic electrical fault on alternative fuel rail temperature sensor (CNG/LPG/H2 systems).

Affected components

  • Alt fuel rail temp sensor
  • Sensor wiring

Common causes

  • High likelihood: Sensor failed

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • This code can affect emissions
  • A drive cycle may be required after repair

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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