P0473: A high exhaust-pressure circuit signal is separate from real overpressure

P0473 is exhaust-pressure sensor A circuit high. In Ford’s diesel summary, it appears with P0472 beneath an upstream turbine pressure signal-range heading. The listed high electrical boundary is above 4.8 V, with a typical two-second monitoring duration.

A high signal is not automatically high gas pressure

This electrical classification is separate from P0471’s stopped-engine pressure offset and P0474’s running model comparison. A diagnostic display may translate signal voltage into pressure, but an electrically invalid input cannot simply be treated as a trustworthy pressure measurement.

Useful evidence therefore preserves whether the fault is a circuit-range result or a plausible-range pressure disagreement. A later pressure value that appears normal does not demonstrate that an earlier intermittent high electrical excursion has been resolved.

Confirm the exact sensor specification

The source’s main heading and DTC descriptions identify exhaust pressure, but two internal subheadings refer to reductant pressure. That apparent copy/paste inconsistency means the listed limit should be confirmed in the correct vehicle service procedure before using it as a physical test specification.

The summary does not provide connector pin identity, a universal sensor transfer function, or an automatic sensor replacement rule. It supplies a high-circuit classification and its surrounding monitor context. Determine the actual reporting sensor and applicable circuit method before attributing P0473 to genuine exhaust overpressure or selecting a component to replace.

Source and applicability

This explanation follows Ford’s 2023–2024 diesel OBD summary. Match the vehicle’s engine and calibration before applying these monitor values; a generic code alone does not establish fitment. Ford PDF, page 69 · Ford PDF, page 70.