P0472 fault code: what it means

P0472: Exhaust back-pressure sensor A circuit low.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

sensor wiring shorted or open
failed sensor

P0472 by make

Mazda

Exhaust gas pressure sensor No.1 circuit low (before turbo on SKYACTIV-D). EGR and DPF regeneration are inhibited.

Usual causes: exhaust pressure sensor No.1; sensor pipe cracked or blocked; wiring shorted to ground

Mercedes-Benz

DPF exhaust pressure sensor signal low.

Usual causes: faulty pressure sensor; sensor pipe off; wiring fault

What the repair usually costs

CVT valve body replacement (remanufactured, in car)NZ$1,280–NZ$2,420 · A$1,200–A$2,400

Not sure what P0472 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.