P1406 fault code: what it means

P1406: Isuzu code: EGR valve position circuit/performance; often carbon blocking the valve.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

carbon-blocked EGR valve
faulty EGR valve/position sensor
wiring

P1406 by make

Isuzu

Isuzu code: EGR valve position circuit/performance; often carbon blocking the valve.

Usual causes: carbon-blocked EGR valve; faulty EGR valve/position sensor; wiring

What the repair usually costs

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

Not sure what P1406 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.