P0473 fault code: what it means

P0473: Exhaust back-pressure sensor A circuit high.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

failed sensor
blocked hose
wiring fault

P0473 by make

Mazda

Exhaust gas pressure sensor No.1 circuit high. EGR and DPF regeneration are inhibited.

Usual causes: exhaust pressure sensor No.1; open circuit or short to power

Mercedes-Benz

DPF exhaust pressure sensor signal high.

Usual causes: blocked sensor pipe; faulty pressure sensor; full DPF

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 P0473 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.