16600-5X30A — Technical Research
Denso common-rail solenoid injector (Denso number 295050-1050, code DCRI301050) for the Nissan 2.5 dCi YD25DDTi engine, fitted to the Navara D40, NP300 Pickup and Cabstar. Nissan OE number 16600-5X30A. Common failure drivers on the YD25 are poor fuel filtration, fuel contamination and water ingress. Key symptoms: Hard starting / extended cranking; Rough idle and vibration; Black smoke; Loss of power / limp mode. Common failure modes: Internal wear / high back-leakage; Corrosion from water in fuel; Nozzle coking / poor atomisation.
Denso 16600-5X30A 2.5 dCi (YD25DDTi) Common Rail Injector
Denso common-rail solenoid injector (Denso number 295050-1050, code DCRI301050) for the Nissan 2.5 dCi YD25DDTi engine, fitted to the Navara D40, NP300 Pickup and Cabstar. Nissan OE number 16600-5X30A. Common failure drivers on the YD25 are poor fuel filtration, fuel contamination and water ingress. Key symptoms: Hard starting / extended cranking; Rough idle and vibration; Black smoke; Loss of power / limp mode. Common failure modes: Internal wear / high back-leakage; Corrosion from water in fuel; Nozzle coking / poor atomisation.
Injector back-leakage drops cranking rail pressure on the YD25, making the engine slow to start, especially cold.
A worn or leaking injector unbalances cylinder fuelling, producing a shaky idle on the 2.5 dCi.
Poor atomisation from a worn nozzle over-fuels the cylinder.
Out-of-range injector delivery triggers reduced performance or limp mode on the YD25DDTi.
A leaking injector causes a pronounced top-end knock on the YD25, often mistaken for timing-chain noise.
Over-fuelling or internal leakage wastes fuel and can fail emissions.
- InstallationThe YD25 is sensitive to fuel quality - replace the fuel filter and check for water/debris before fitting the new injector, or the replacement will fail again.
- InstallationAlways fit a new copper sealing washer and use the correct tightening torque - missing seals or over-torque are common YD25 installation faults.
- codingEach Denso common-rail injector carries an individual correction (ID/QR) code that must be written into the ECU after fitting; without coding the engine runs on default trim and may log cylinder-balance faults.
- MisdiagnosisRead live injector correction/back-leakage values to find the weak cylinder before removal rather than replacing all injectors blind.
- WarningWater-in-fuel causes corrosion on the YD25 - address the contamination source before fitting replacements.
- TestingTest on a Denso-capable common-rail bench across delivery and back-leakage points before refitting.
What is Denso injector 16600-5X30A?+
A Denso common-rail solenoid diesel injector for the Nissan 2.5 dCi YD25DDTi engine. Denso number 295050-1050 (code DCRI301050); Nissan OE number 16600-5X30A.
Which vehicles use 16600-5X30A?+
Nissan Navara (D40), NP300 Pickup and Cabstar with the 2.5 dCi YD25DDTi engine.
Is it solenoid or piezo?+
It is a Denso solenoid common-rail injector.
What is the Denso number for 16600-5X30A?+
Denso 295050-1050, also referenced as DCRI301050. The Nissan OE number is 16600-5X30A.
What are the symptoms of a failing 16600-5X30A?+
Hard starting, rough idle and vibration, black smoke, diesel knock, loss of power or limp mode, and higher fuel consumption.
Why does my YD25 Navara knock or rattle?+
A leaking injector causes a top-end knock on the YD25 that is often mistaken for timing-chain noise. Bench-test to confirm the faulty cylinder before replacing.
What causes these injectors to fail?+
Poor fuel filtration, fuel contamination and water in the fuel - so fix the cause, not just the injector.
Do I need to code the injector to the ECU?+
Yes. Each Denso injector has an individual correction code that must be written into the ECU after fitting, or the engine will run on default trim and may log cylinder-balance faults.
Should I replace one or all four?+
Diagnose each with live correction and back-leakage values; on high-mileage YD25 engines failures often cluster, so check all of them.
Why renew the copper washer?+
It is a one-use crush seal; a missing or reused washer causes blow-by and carbon build-up around the injector.
Does a remanufactured 16600-5X30A perform like new?+
A properly remanufactured injector is bench-tested and recalibrated to the Denso plan to meet original delivery and back-leakage specifications.
Does it fit the Pathfinder R51?+
The Pathfinder R51 uses the YD25DDTi engine, but injector revisions vary by model year and emissions - confirm the exact number stamped on your original injector by VIN before ordering.