DCRI300770 — Frequently Asked Questions
Verified answers about the Denso DCRI300770 1.6 CDTI (B16DTH/B16DTN) Common Rail Injector (Vauxhall/Opel Astra J/K, Zafira C, Mokka).
What is Denso injector DCRI300770?
A Denso common-rail diesel injector for the GM/Opel 1.6 CDTI (B16DTH/B16DTN) engine. GM OE 55570012.
Which vehicles use DCRI300770?
Vauxhall/Opel Astra J/K, Zafira Tourer C and Mokka/Mokka X with the 1.6 CDTi engine.
Is it solenoid or piezo?
It is a Denso solenoid common-rail injector.
Does DCRI300770 need coding?
Yes - write the injector code to the correct cylinder with GM MDI when fitting.
What are the OE part numbers?
GM/Vauxhall 55570012 (alternate 95521531) references Denso DCRI300770 (Denso 295050-0770).
Which engine codes does it fit?
The 1.6 CDTI 'Whisper Diesel' B16DTH and B16DTN; confirm the exact code by VIN.
What are the symptoms of failure?
Rough idle, vibration, hard starting, black smoke, power loss/limp mode and an EML.
Why does my 1.6 CDTI run rough?
A worn or leaking injector unbalances fuelling; read live back-leakage data and bench-test the weak cylinder.
What causes these injectors to fail?
Poor fuel filtration, contamination and back-leakage wear - fix the cause first.
Does a remanufactured DCRI300770 perform like new?
A properly remanufactured injector is bench-tested and recalibrated to the Denso plan, then coded on fitment.