The Peugeot WJZ (DW8) is a 1,868 cc, inline‑four turbo‑diesel engine produced between 1999 and 2005. It features a cast iron block, aluminium head, and single overhead camshaft (SOHC) with 8 valves. This unit delivered 66 kW (90 PS) and 205 Nm of torque, utilising indirect injection and a fixed-geometry turbocharger for dependable low-end response and economical cruising.
Fitted to models such as the Peugeot 306, 406, and Citroën Xsara and Xantia, the WJZ was engineered for robust, low-maintenance performance in compact and mid-size vehicles. Its design prioritised durability and cost-effective ownership. Emissions compliance for most units was achieved to meet Euro 2 standards through mechanical injection pump and catalytic converter technology.
One documented concern is premature failure of the vacuum pump diaphragm, which can lead to loss of brake servo assistance and hard pedal feel, as noted in Peugeot Technical Note 9914 C. This failure is often attributed to material fatigue and exposure to engine heat over time.
Production years 1999–2005 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/2022).
The Peugeot WJZ (DW8) is a 1,868 cc inline‑four turbo‑diesel engineered for compact and mid-size hatchbacks and estates (1999-2005). It combines indirect injection with a fixed-geometry turbocharger to deliver robust low-RPM torque and simple, reliable operation. Designed to meet Euro 2 standards, it prioritises durability and straightforward maintenance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,868 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 83.0 mm × 86.5 mm | |
| Power output | 66 kW (90 PS) @ 4,000 rpm | |
| Torque | 205 Nm @ 2,000 rpm | |
| Fuel system | Bosch VP37 mechanical rotary injection pump | |
| Emissions standard | Euro 2 | |
| Compression ratio | 21.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Fixed-geometry turbo (Garrett) | |
| Timing system | Belt-driven (requires periodic replacement) | |
| Oil type | PSA B71 2290 (SAE 15W‑40) | |
| Dry weight | 138 kg |
The fixed-geometry turbo provides predictable low-RPM torque ideal for relaxed driving but requires strict adherence to 30,000 km oil change intervals to prevent injector pump wear. PSA B71 2290 (15W-40) oil is critical for engine longevity. The mechanical injection system is robust but sensitive to fuel contamination; always use high-quality diesel. The timing belt must be replaced at 100,000 km to prevent catastrophic failure, as this is an interference engine.
Oil Specs: Requires PSA B71 2290 specification oil (Peugeot Service Manual 9914). ACEA B2 is the minimum acceptable standard.
Emissions: Euro 2 certification applies to all production years (VCA Type Approval #VCA/EMS/2022).
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model applications (Peugeot Group PT-2001).
Peugeot Technical Information System: Docs 9914, 9914 C
VCA Type Approval Database (VCA/EMS/2022)
ISO 1585: Road vehicles — Engine test code — Net power
The Peugeot WJZ (DW8) was used across PSA Group's PF2 platform with transverse mounting and shared with Citroën. This engine received minor ECU mapping variations between models-for instance, slightly different boost curves in the 306 versus the 406-but core mechanical components remain interchangeable. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, just below the exhaust manifold (Peugeot TIS Doc. 9914). The 8th VIN digit typically corresponds to the engine type ('Z' for WJZ in many PSA applications). Visually, it can be identified by its black plastic cam cover with "DW8" embossed on it and the prominent Bosch VP37 injection pump on the side of the engine. Critical differentiation from the later DW10 engine: The WJZ (DW8) has an 8-valve SOHC head and a mechanical injection pump, while the DW10 has a 16-valve DOHC head and common-rail injection. Service parts are not interchangeable.
The WJZ (DW8)'s primary reliability risk is vacuum pump diaphragm failure, with elevated incidence in high-mileage engines. Peugeot Technical Note 9914 C documents this issue, while general owner feedback highlights injection pump failures as a major cause of drivability problems. Neglecting preventative maintenance on the fuel system makes adherence to the service schedule critical.
Analysis derived from Peugeot technical bulletins (1999-2005) and general owner-reported failure data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT WJZ-DW8.
Comprehensive technical documentation and regulatory references
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PEUGEOT Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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VCA Certification Portal
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