Denso
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Upgrade or replace your injectors with confidence using this Set of 4× Genuine Denso injector bodies, designed to suit Isuzu D-MAX 4JJ1 Pre-DPF (2012–2016) models. Available in standard OEM flow or modified performance-upgraded +30 / +50 specifications with MCR performance nozzles, these genuine injectors are ideal whether you're maintaining factory reliability or building for high-boost power.
Choose your specification:
🔹 Standard Flow (OEM Replacement)
🔹 Modified +30 Performance Injectors
🔹 Modified +50 High-Flow Injectors
⚠️ Important: Modified +30 and +50 injectors require professional ECU tuning for safe operation. Running modified injectors without proper tuning will cause over-fueling and unsafe conditions.
Installing injectors requires proper hardware. Here's what you need:
Essential — Injector Washer Kit:
Copper washers for proper sealing. Never reuse old washers — they won't seal properly the second time.
🛒 Add Injector Washer and O-ring KitEssential — 4JJ1 Injector Lines (2012-2016):
Reusing old injector lines is the #1 cause of post-install leaks. Always replace when fitting new injectors.
🛒 Add 4JJ1 Injector Lines (2012-2016)💡 Pro Tip: Always use new copper washers and injector lines. Injector coding required — compensation codes must be programmed to ECU using diagnostic equipment.
✅ Fitment verification: Check the injector compensation code on your plug — it should start with '72'. Not sure? Leave your VIN and rego in the cart notes and we'll confirm.
⚠️ PRE-DPF ONLY: These injectors suit 2012-2016 pre-DPF models only. Not compatible with DPF-equipped vehicles.
Denso Part Numbers:
GM / Isuzu Part Numbers:
Alternate Part Numbers:
Multiple part numbers due to supersessions and regional variations. All refer to the same genuine Denso injector.
Professional installation recommended.
Installation considerations:
⚠️ ECU Coding Required: Injector compensation codes must be programmed into the ECU during installation. This requires diagnostic equipment and should be performed by a qualified diesel technician.
Standard Flow Injectors:
+30 Performance Injectors (MCR Nozzles):
+50 High-Flow Injectors (MCR Nozzles):
*Orders placed before 2 pm AEST on business days, subject to stock availability.
For off-road / competition use only (modified +30/+50 variants). Modified injectors require ECU tuning and may affect compliance. Check local regulations before purchase.
Q: Are these genuine Denso injectors or aftermarket?
A: These are genuine Denso injector bodies. Standard flow injectors are completely OEM. +30/+50 variants use genuine Denso bodies with MCR upgraded nozzles.
Q: What's the difference between Standard, +30, and +50?
A: Standard = OEM flow rate. +30 = 30% increased fuel delivery (MCR nozzles) for moderate performance builds. +50 = 50% increased fuel delivery (MCR nozzles) for serious power builds (250+ RWHP).
Q: Do I need tuning for standard injectors?
A: No — standard flow injectors are direct OEM replacements and don't require tuning. +30 and +50 variants require professional ECU tuning.
Q: Will these fit my 2017+ D-MAX?
A: No — these are specifically for 2012-2016 pre-DPF models. Later DPF-equipped models use different injectors.
Q: How do I know if my truck is pre-DPF?
A: Check the injector compensation code on your plug — it should start with '72'. DPF models have different codes. Send us your VIN if unsure.
Q: Do injectors come with seals/washers?
A: No — use the buttons above to add the washer kit to your cart. Never reuse old washers.
Q: Can I install these myself?
A: Professional installation strongly recommended. Injector coding requires diagnostic equipment to program compensation codes into the ECU.
Q: What power can I expect with +30 or +50 injectors?
A: Power depends on your complete setup. +30 suits 180-220 RWHP builds. +50 suits 250+ RWHP builds. Requires supporting mods (turbo, intercooler, exhaust, tuning).
Q: Are these new or remanufactured?
A: Brand new genuine Denso injector bodies. Not remanufactured.
Q: How do I verify fitment for my vehicle?
A: Leave your VIN and rego in the cart notes before checkout, or contact us before ordering. We'll confirm compatibility.
OEM quality or performance upgrade. Set of 4 injectors. Professional installation recommended. Free express shipping Australia-wide.
Disclaimer: Common Rail Cowboys is not affiliated with Isuzu Motors, Denso Corporation or MCR. Professional installation and ECU coding required for all injector installations. Modified injectors (+30/+50) require professional ECU tuning.
