P0409 fault code: what it means

P0409: EGR sensor A circuit.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

1. faulty EGR valve sensor
2. wiring or connector

P0409 by make

What the repair usually costs

• EGR valve replacement or cleanNZ$350–NZ$1,710 · A$330–A$1,630

Not sure what P0409 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.