P0472 Exhaust Pressure Sensor Low

P0472 points to a low signal from the exhaust pressure sensor. The controller sees exhaust pressure voltage or feedback below the expected range.

Code details

Generic OBD-II · P0

System: Emissions
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace exhaust hardware until the low pressure signal path and pressure tube are checked.

Symptoms of P0472

Check-engine light, often with no obvious change in how the car drives.
A failed emissions test or incomplete readiness monitors.
Sometimes a faint fuel-vapour smell (on EVAP codes).

Common causes of P0472

A worn catalytic converter or an oxygen/air-fuel sensor reading out of range.
EVAP leaks — a loose or failed gas cap, cracked hose, or purge/vent valve.
Exhaust leaks, fuel-trim problems, or a fault in a related monitor.

Useful checks before replacing parts

Check sensor signal voltage, reference voltage, ground, freeze-frame load, exhaust pressure reading, and related low-input or reference codes.
Inspect for short-to-ground faults, open reference circuits, blocked pressure tubes, disconnected hoses, connector corrosion, and sensor contamination.
Compare key-on and running readings to determine whether the circuit is electrically low or the pressure source is not reaching the sensor.

Related OBD-II codes

These nearby emissions entries can help compare wording and pin down the fault area.