D4FD Diesel Injectors
Compatible with Hyundai i40 (VF), Hyundai ix35 (LM), Kia Carens (RP), and 2 more
- OEM Tested & Calibrated
- 12-Month Warranty
- Free UK Delivery
Select the correct injector for your D4FD engine below
Fits Hyundai i40 (VF), Hyundai ix35 (LM), Kia Carens (RP), Kia Optima (TF) and more
Top injectors for D4FD
Compatible Injectors for D4FD
- OEM Tested
- 12-Month Warranty
- Free UK Delivery
Common problems solved by these injectors
About the D4FD engine
The D4FD is a 1.7l crdi common rail diesel engine. This engine uses Bosch diesel injectors.
How Diesel Injectors Are Remanufactured
Watch our 3D walkthrough of the diesel injector remanufacturing process and see how injectors are professionally restored for reliable service.
Vehicles Using D4FD Engine
| Vehicle | Engine | Years |
|---|---|---|
| Hyundai i40 (VF) injector | 1.7 CRDi | 2011–2019 |
| Hyundai ix35 (LM) injector | 1.7 CRDi | 2010–2015 |
| Kia Carens (RP) injector | 1.7 CRDi | 2013–2019 |
| Kia Optima (TF) injector | 1.7 CRDi | 2012–2015 |
| Kia Sportage (SL) injector | 1.7 CRDi | 2010–2016 |
Common D4FD Injector Problems
Rough idle and engine vibration
Worn injector nozzles cause uneven fuel spray, leading to rough idle at low RPM. Most noticeable when the engine is cold.
Excessive exhaust smoke
Black or blue-grey smoke on acceleration indicates poor fuel atomisation. This is often caused by carbon buildup on the injector nozzle tip.
Poor fuel economy
A worn or leaking injector delivers incorrect fuel quantities, reducing efficiency by 10–20% in severe cases.
Engine misfire under load
Intermittent misfires during acceleration suggest one or more injectors are failing to deliver the correct fuel pressure.
Difficult cold starting
Degraded injector nozzles struggle to atomise fuel at lower cranking pressures, causing extended crank times in cold weather.
Loss of power
Gradual power loss across the rev range, particularly above 2500 RPM, can indicate injector flow rate degradation.
Increased diesel knock
Louder than normal combustion noise, especially at idle, can indicate incorrect injection timing due to worn injector internals.
D4FD Technical Specifications
Displacement
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Power
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Torque
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Fuel System
Common Rail Direct Injection
The D4FD is a 1.7l crdi common rail diesel engine. This engine uses Bosch diesel injectors.
Engine Intelligence
Hyundai / Kia 1.7 CRDi (D4FD — i40, ix35, Sportage, Optima, Carens)
Documented failure modes
- Nozzle / needle-seat wear from poor fuel quality causing excessive leak-off and starting problems
- Injector over-fuelling diluting the engine oil when leakage is advanced
- Rail-pressure faults that mimic injector failure when actual pressure deviates from target
Diagnostic guidance
- Compare actual vs target rail pressure in live data first — a pressure-regulator fault mimics injector failure on this engine
- Run a leak-off comparison across all four injectors before condemning one
- Check the engine-oil level and smell for fuel dilution on suspected leaking injectors
- Injector coding is required after fitting — follow the manufacturer procedure
Fitment note: The 1.7 CRDi (D4FD) ran several outputs and emissions steps with different Bosch references — always match the reference etched on the injector body.
Related D4FD Engine Guides
Related Pages
Bosch 1.7L CRDi — browse compatible engines, vehicles, and injectors
Compatible Vehicles
Recommended Injector
0445110411
Bosch — View product page