Denso DCRI300050 Diesel Injector

On the 1.7L CDTi platform, a failing DENSO DCRI300050 injector typically presents as: hard cold starting or no-start; rough or lumpy idle with shaking; misfire or intermittent running on fewer cylinders; knocking under load, smoke from the exhaust; limp mode, power loss or stuttering acceleration.

When two or more of these appear together, suspect the injector before peripheral systems — a comparative leak-off test and live-data cylinder-balance review will isolate the failed unit without tear-down.

The documented failure modes on this platform are: injector seal leakage — soot build-up, diesel smell and rough running (a recurring 1.7 cdti issue); fuel contamination or water in the fuel damaging the denso injectors; injector-driver electronics faults that log circuit codes without the injector itself being bad.

Internal wear cannot be repaired in situ — once delivery drifts outside calibration, remanufacture or replacement is the reliable fix.

On this platform injector circuit codes frequently trace to the injector driver/ECU or wiring rather than the injector — test the electrical side before condemning hardware. Inspect injector seals for soot and smell — seal leakage is a documented recurring fault. Check fuel-filter service history and for fuel contamination before fitting replacements. Denso injectors carry an ID code — register the new code after fitting.

Never condemn a common-rail injector on a fault code alone — codes identify the circuit or cylinder, while leak-off volumes and correction values identify the component.

Each remanufactured DCRI300050 is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is then calibrated on a common-rail test bench against the manufacturer's specification sheet — delivery, back-leak and response are all verified before the injector is sealed and despatched with its calibration data on file.

Every unit carries a 12-month parts warranty and free UK delivery.

The DCRI300050 trusted family covers 4 verified vehicle fitments across 2 makes: Vauxhall and Chevrolet. Every fitment listed on this page is registry-verified — no scraped or assumed applications.

DCRI300050 supersedes or cross-references 6 further OE numbers, including 295050-0050, 2950500050, 821005, 55567729, 5-5567729C-A and 55567729CA. Always match the reference etched on your failed unit's body — cross-references within a family are verified equivalents, but etched numbers remain the source of truth.