P0473 — Exhaust Pressure Sensor High

The controller detects a high electrical signal or voltage in the exhaust-pressure sensor circuit. High input describes the monitored electrical value, not necessarily a physically high fuel level or pressure. The code does not by itself identify the failed component; the exact circuit design and vehicle-specific thresholds must be checked before drawing a conclusion.

Affected system: Exhaust pressure sensing

Symptoms

• Reduced power under load; possible limp mode.

Possible causes

• Faulty sensor, damaged wires or blocked pressure pipes.

What to check

• Inspect the electrical circuit and pressure pipes for faults.

Also written as: P0473-00, P047300, PO473 (some scan tools add the fault-type byte, e.g. -00).