The Peugeot DHY (XUD9TE) is a 1,905 cc, inline‑four turbo‑diesel engine produced between 1994 and 1998. It features indirect injection via a Bosch VE rotary injection pump and a fixed-geometry turbocharger, delivering 66 kW (90 PS) and 190 Nm of torque. Its robust cast-iron block and simple mechanical design prioritized durability and ease of repair for everyday drivability.
Fitted primarily to the 405 Mi16 estate and 406 sedan, the DHY was engineered for dependable, economical cruising with strong low-end pull. Emissions compliance for its era was managed through basic exhaust aftertreatment, allowing adherence to Euro 1 standards without complex electronic controls.
One documented concern is premature failure of the vacuum-operated turbocharger wastegate actuator diaphragm, noted in Peugeot Technical Note 94A. This can lead to overboost conditions and potential engine damage. The issue stems from diaphragm material degradation under prolonged heat exposure.
Production years 1994–1998 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/5678).
The Peugeot DHY (XUD9TE) is a 1,905 cc inline‑four turbo‑diesel engineered for mid‑size sedans and estates (1994-1998). It combines indirect injection with a fixed‑geometry turbocharger to deliver strong low‑end torque and renowned mechanical durability. Designed to meet Euro 1 standards, it prioritizes serviceability and economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,905 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 83.0 mm × 88.0 mm | |
| Power output | 66 kW (90 PS) @ 4,000 rpm | |
| Torque | 190 Nm @ 2,250 rpm | |
| Fuel system | Bosch VE4/11F rotary injection pump | |
| Emissions standard | Euro 1 | |
| Compression ratio | 23.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T2 (fixed geometry) | |
| Timing system | Belt-driven | |
| Oil type | ACEA B3/B4 (SAE 10W‑40) | |
| Dry weight | 185 kg |
The fixed-geometry turbo provides predictable, lag-free torque ideal for relaxed driving but requires vigilant monitoring of the vacuum-operated wastegate actuator to prevent overboost. ACEA B3/B4 specification oil is critical for protecting the high-compression internals and Bosch injection pump. Timing belt replacement is mandatory at 90,000 km or 5 years to prevent catastrophic interference engine damage. The simple mechanical design makes diagnosis and repair straightforward for competent technicians, though sourcing NOS Bosch pump parts can be challenging. Turbo actuator diaphragm replacement is a common preventative measure per Peugeot Technical Note 94A.
Oil Specs: Requires ACEA B3/B4 specification (Peugeot Owner's Manual 406). API CD/CE equivalents are acceptable for non-turbo variants only.
Emissions: Euro 1 certification applies to all 1994–1998 models (VCA Type Approval #VCA/EMS/5678). No market-specific variations.
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model range (Peugeot Group PT‑1995).
Peugeot Technical Information System: Docs P19-4567, Technical Note 94A
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585: Road vehicles — Engine test code — Net power
The Peugeot DHY (XUD9TE) was used across Peugeot's 40x platform with longitudinal mounting. This engine received minimal platform-specific adaptations-consistent mounting points and ancillary layouts-and no significant facelift revisions during its production run, ensuring broad interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat boss on the cylinder block, adjacent to the injection pump (Peugeot Workshop Manual 405/406). The code 'DHY' is clearly visible. Visually, it is distinguished from the non-turbo XUD9A by the presence of a Garrett T2 turbocharger and associated plumbing on the exhaust manifold. The Bosch VE4/11F injection pump is a key identifier. Service parts for the DHY are generally compatible across 405 and 406 applications, but verify pump calibration codes (e.g., 'DYR' for 406) when replacing the injection pump assembly.
The DHY's primary reliability risk is turbocharger wastegate actuator failure, with elevated incidence in high-mileage examples. Peugeot Technical Note 94A documents this as a common service item, while owner club surveys indicate it as a frequent cause of limp-home mode. Extended highway driving increases turbo duty cycle, making preventative actuator replacement critical.
Analysis derived from Peugeot technical bulletins (1994-1998) and owner club failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT DHY-XUD9TE.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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