4HS Diesel Injectors
Compatible with Citroen C-Crosser, Citroen C5, Citroen C6, and 4 more
- OEM Tested & Calibrated
- 12-Month Warranty
- Free UK Delivery
Select the correct injector for your 4HS engine below
Fits Citroen C-Crosser, Citroen C5, Citroen C6, Ford Mondeo and more
Top injectors for 4HS
Compatible Injectors for 4HS
- OEM Tested
- 12-Month Warranty
- Free UK Delivery
Popular 4HS injectors
Common replacements fitted to Citroen C-CrosserEach link opens the product page with full fitment, pricing and warranty information.
Common problems solved by these injectors
About the 4HS engine
The 4HS is a 2.2l hdi / tdci 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 4HS Engine
| Vehicle | Engine | Years |
|---|---|---|
| Citroen C-Crosser injector | 2.2 HDi | 2007–2012 |
| Citroen C5 injector | 2.2 HDi | 2006–2012 |
| Citroen C6 injector | 2.2 HDi | 2006–2012 |
| Ford Mondeo injector | 2.2 TDCi | 2008–2014 |
| Peugeot 4007 injector | 2.2 HDi | 2007–2012 |
| Peugeot 407 injector | 2.2 HDi | 2006–2011 |
| Peugeot 607 injector | 2.2 HDi | 2006–2010 |
Common 4HS 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.
4HS Technical Specifications
Displacement
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Power
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Torque
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Fuel System
Common Rail Direct Injection
The 4HS is a 2.2l hdi / tdci common rail diesel engine. This engine uses Bosch diesel injectors.
Engine Intelligence
PSA / Ford 2.2 HDi & TDCi (DW12 — 407, 607, C5, C6, C-Crosser, Outlander)
Documented failure modes
- Bosch piezo injectors are highly sensitive to return-line restriction — a blocked return circuit causes rough idle, hard starting and knock without the injector being dead
- Injector correction values drifting out of range as the unit wears
- Injector seat seal leakage producing tar-like deposits around the injectors
Diagnostic guidance
- Check the injector return lines and their filters for blockage before condemning a piezo injector — return restriction mimics injector failure on this engine
- Read injector correction values: unusually high corrections identify a worn unit
- Rule out rail-pressure control (regulator / relief valve) faults on persistent starting and idle complaints
- Inspect wiring and connectors — electrical faults can mimic a bad injector
Fitment note: The 2.2 HDi/TDCi DW12 family spans PSA (4H*) and Ford (Q4BA/Q4WA) engine codes with different injector references by generation — match the number etched on the injector body.
Related 4HS Engine Guides
Related Pages
Bosch 2.2L HDi / TDCi — browse compatible engines, vehicles, and injectors