5WS40000-Z — Frequently Asked Questions
Verified answers about the Siemens VDO 5WS40000-Z 2.0 HDi Common Rail Injector (Peugeot/Citroen RHY).
What is injector 5WS40000-Z?
5WS40000-Z is a Siemens VDO / Continental common rail piezo injector diesel injector for the PSA 2.0 HDi (RHY / DW10TD). It is supplied remanufactured, bench-tested and calibrated to OEM specification.
Which vehicles use 5WS40000-Z?
It is fitted to the PSA 2.0 HDi (RHY / DW10TD) — including Citroen Berlingo 2.0 HDi 90 (RHY); Citroen Xantia 2.0 HDi 90 (RHY); Citroen C5 (I) 2.0 HDi 90 (RHY); Peugeot 206 2.0 HDi 90 (RHY). Confirm fitment by OE number and engine code.
What type of injector is 5WS40000-Z?
It is a Siemens VDO / Continental Common Rail Piezo Injector. Always confirm the OEM markings on the injector body before fitting.
Does 5WS40000-Z need coding when fitted?
Usually no — the early 2.0 HDi RHY (DW10TD) generally runs without injector classification coding. Verify the requirement on the ECU with Lexia/PP2000.
What are the symptoms of a failing 5WS40000-Z?
Common signs are rough idle and vibration, hard starting, power loss or limp mode, black smoke and an engine-management light.
What causes these injectors to fail?
Most failures come from poor fuel filtration, contamination and water in the fuel leading to wear, high back-leakage and nozzle coking. Fix the cause before fitting replacements.
Is a remanufactured 5WS40000-Z as good as new?
A properly remanufactured injector is stripped, fitted with new wear parts, reassembled and recalibrated on a common-rail test bench to OEM tolerances, then supplied with a warranty.
Should I replace one injector or the full set?
Replace the confirmed faulty injector first. On high-mileage engines fitting a matched set reduces the chance of a repeat fault, but it is not mandatory if the others test within spec.
Do you bench-test the injector before dispatch?
Yes. Every unit is tested for delivery, back-leakage and spray pattern on a calibrated common-rail tester before it leaves us.
Is delivery and warranty included?
Yes — the price includes free UK delivery and a 12-month warranty.
Does the early 2.0 HDi RHY need injector coding?
Generally no — the early DW10TD (RHY) is usually fitted without classification coding, unlike the later DW10BTED4. Always verify the requirement on the specific ECU before road test.
What are the PSA OE numbers for 5WS40000-Z?
PSA references include 9636819380, 9652173780 and 1980F0; the Siemens VDO base number is 5WS40000 (the -Z and other suffixes interchange).