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This injector is available and fully tested. Original product images are being updated.
- OEM Tested & Calibrated
- 12-Month Warranty
- Free UK Delivery
Need Help Confirming Fitment?
Not sure this injector fits your vehicle? Check using your registration number before ordering.
Delphi R04401D Diesel Injector
DELPHIPart No: R04401D
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In Stock — Ships within 24 hours
R04401D Delphi injector. OEM tested & calibrated.
Every order includes a 12-month workshop warranty, OEM bench-calibration before despatch.
Why Buy From Us
FREE UK Delivery
International Delivery — flat £50 per order
One injector or multiple injectors
Need more later? We keep stock available for repeat orders.
Engine Intelligence
Common symptoms
Fitment note: Always confirm compatibility using registration lookup or part number before ordering.
Remanufacturing Process
See how our injectors are rebuilt step-by-step in our 3D remanufacturing process video.
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Product Description
R04401D Delphi injector.
OEM tested & calibrated.
UK stock.
Check compatibility by registration.
Workshop Information
Installation Notes
- Check injector coding after installation
- Ensure fuel system is properly primed
- Use calibrated test equipment for verification
Recommended Injector Coding
No injector coding is required for the Delphi unit on most applications — follow the manufacturer fitting procedure.
Replacement Advice
Always renew the copper washers / seals and bleed the fuel system before first start. Replace only the injectors your diagnosis confirms and torque fasteners to the manufacturer's published values.
Professional Installation
We recommend installation by a suitably equipped diesel specialist using calibrated test equipment to verify the fuel system after fitting.
Common Symptoms of a Failed R04401D Injector
If your vehicle shows these symptoms, replacing the diesel injector may restore engine performance. A leak-off test can confirm the diagnosis.
Testing & Warranty
All remanufactured injectors are tested using OEM-grade diagnostic equipment to ensure fuel pressure and spray pattern meet manufacturer specifications.
OEM Test Bench Calibration
Flow-tested on Bosch EPS 200 series bench to verify fuel delivery rates at all operating pressures.
Leak-Off Testing
Each injector is tested for return flow to ensure no excess fuel is wasted back to the tank.
Solenoid Calibration
Electrical response time verified to ensure precise injection timing and quantity.
12-Month Warranty
Full replacement or refund covering manufacturing defects under normal use. No quibble.
Frequently Asked Questions
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