DCRI300770 — Symptoms & Failure Modes
Common symptoms and verified failure modes of a failing Denso DCRI300770 1.6 CDTI (B16DTH/B16DTN) Common Rail Injector (Vauxhall/Opel Astra J/K, Zafira C, Mokka).
Rough idle / vibration · high
A leaking injector unbalances cylinder fuelling on the 1.6 CDTI.
Hard starting · high
Excess back-leakage drops cranking rail pressure.
Loss of power / limp mode · high
Out-of-range delivery or rail-pressure deviation cuts power.
Black smoke · medium
Poor atomisation over-fuels the cylinder.
Engine management light · medium
Cylinder-specific injector or fuel-metering codes.