Citroen C4 8HZ Injectors

Citroen C4 8HZ Overview

The Citroen C4 with the 8HZ 1.4L HDi/TDCi engine was produced between 2004 and 2011. This vehicle uses Siemens VDO / Continental common rail diesel injectors (primary part number A2C59511612) operating at fuel pressures up to 2000 bar. The 8HZ engine in the Citroen C4 produces and of torque. When replacing injectors on the Citroen C4 8HZ, always use new copper sealing washers and torque to manufacturer specifications. Each injector should be coded to the ECU after fitting.

Compatible Injectors

Common Injector Problems in Citroen C4

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  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.
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  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.
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  Poor fuel economy — A worn or leaking injector delivers incorrect fuel quantities, reducing efficiency by 10–20% in severe cases.
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  Engine misfire under load — Intermittent misfires during acceleration suggest one or more injectors are failing to deliver the correct fuel pressure.
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  Difficult cold starting — Degraded injector nozzles struggle to atomise fuel at lower cranking pressures, causing extended crank times in cold weather.

Other Engine Codes for Citroen C4

Other 8HZ Vehicles

Related Pages

Siemens VDO / Continental 1.4L HDi/TDCi — browse compatible engines, vehicles, and injectors