Peugeot 406 RHY Injectors

Peugeot 406 RHY Overview

The Peugeot 406 with the RHY PSA 2.0 HDi (RHY) engine was produced between 1999 and 2004. This vehicle uses Siemens VDO / Continental common rail diesel injectors (primary part number 5WS40000-Z) operating at fuel pressures up to 2000 bar. The RHY engine in the Peugeot 406 produces and of torque. When replacing injectors on the Peugeot 406 RHY, 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 Peugeot 406

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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 RHY Vehicles

Related Pages

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