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P0129 Powertrain

Barometric Pressure Too Low

Barometric pressure reading below the plausible minimum. Either operating at extreme altitude or sensor fault.

Affected components

  • Barometric pressure sensor

Common causes

  • High likelihood: Sensor reading drifted low

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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