P20CF fault code: what it means

P20CF: Exhaust fuel addition (5th) injector stuck open on D-4D diesels: diesel is leaking into the exhaust. Smoke, high EGT and fire risk.

Engine and gearbox (powertrain) · Safety risk

Usual causes, most likely first

1. carboned or failed exhaust fuel addition injector
2. injector wiring fault

P20CF by make

Not sure what P20CF 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.