P042F fault code: what it means

P042F: EGR valve A stuck closed. Common on 3.0 TDV6 Discovery 4; the EGR valve position error stays high.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

sticking or failed EGR valve
carbon build-up on valve
EGR valve wiring

P042F by make

Land Rover

EGR valve A stuck closed. Common on 3.0 TDV6 Discovery 4; the EGR valve position error stays high.

Usual causes: sticking or failed EGR valve; carbon build-up on valve; EGR valve wiring

What the repair usually costs

Intake valve carbon clean (walnut blast, direct injection)NZ$530–NZ$1,190 · A$560–A$1,240
EGR valve replacement or cleanNZ$350–NZ$1,710 · A$330–A$1,630

Not sure what P042F 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.