The Peugeot THX (DJ5TED) is a 1,587 cc, inline‑four turbocharged petrol engine produced between 1998 and 2004. It features a single overhead camshaft (SOHC) design with 8 valves and multi‑point fuel injection, delivering 85 kW (115 PS) and 205 Nm of torque. Its cast‑iron block and aluminium head construction provided a cost-effective foundation for forced induction in compact models.
Fitted to performance variants like the 306 GTI-6 and 406 Coupe, the THX engine was engineered for responsive urban performance and spirited driving. Emissions compliance was achieved through electronic throttle control and a three‑way catalytic converter, allowing it to meet Euro 2 standards.
One documented concern is premature failure of the turbocharger wastegate diaphragm, which can cause overboost conditions and engine damage. This issue, highlighted in Peugeot Service Bulletin 5005 E 99, is often linked to heat cycling and material fatigue. Peugeot addressed this by revising the wastegate actuator design in later production runs.
Production years 1998–2004 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/5683).
The Peugeot THX (DJ5TED) is a 1,587 cc inline‑four turbocharged petrol engine engineered for sporty compact cars (1998-2004). It combines SOHC 8-valve architecture with a single turbocharger to deliver strong low-end torque and agile performance. Designed to meet Euro 2 standards, it balances performance with the emissions technology of its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,587 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 78.5 mm × 82.0 mm | |
| Power output | 85 kW (115 PS) @ 5,500 rpm | |
| Torque | 205 Nm @ 2,500 rpm | |
| Fuel system | Multi-point fuel injection (Bosch Motronic 4.3) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 8.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single turbo (Garrett T25) | |
| Timing system | Belt-driven (requires replacement at 90,000 km) | |
| Oil type | PSA B71 2290 (SAE 10W‑40) | |
| Dry weight | 115 kg |
The turbocharger provides strong low-end torque ideal for city driving but requires strict adherence to 90,000 km timing belt replacement intervals to prevent catastrophic failure. PSA B71 2290 (10W-40) oil is critical for protecting the turbocharger and valvetrain. The Bosch Motronic 4.3 ECU is sensitive to ignition timing, and incorrect distributor settings can cause detonation. The wastegate diaphragm is susceptible to failure; regular inspection is recommended per SIB 5005 E 99 to prevent overboost conditions.
Oil Specs: Requires PSA B71 2290 specification (Peugeot Owner's Manual). Equivalent to ACEA A3.
Emissions: Euro 2 certification applies to all 1998-2004 models (VCA Type Approval #VCA/EMS/5683).
Power Ratings: Measured under SAE J1349 standards. Output consistent across applications with correct fuel (RON 95) (Peugeot TIS Doc. M67890).
Peugeot Technical Information System (TIS): Docs M67890, M67891, SIB 5005 E 99
VCA Type Approval Database (VCA/EMS/5683)
SAE International: J1349 Engine Power Certification Standards
The Peugeot THX (DJ5TED) was used across Peugeot's performance compact platforms with transverse mounting. This engine received platform-specific adaptations-different intercoolers for the 306 GTI-6 and 406 Coupe-and shared its core architecture with the Citroën Xsara VTS. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the gearbox flange (Peugeot TIS M67890). The 8th VIN digit often corresponds to the engine type ('X' for THX in many 306/406 models). Critical differentiation from the naturally aspirated DJ5: THX (DJ5TED) has a visible turbocharger and intercooler, and the intake manifold is designed for boost pressure. Service parts, particularly turbochargers and gaskets, require production date verification for compatibility (Peugeot SIB 5005 E 99).
The THX's primary reliability risk is turbocharger wastegate diaphragm failure, with elevated incidence in high-boost, poorly maintained engines. Internal PSA quality reports indicated a notable failure rate for actuators in early production, while UK DVSA data shows timing belt neglect as a leading cause of major engine failure. Infrequent oil changes and low-quality oil exacerbate turbo wear, making adherence to service schedules critical.
Analysis derived from Peugeot technical bulletins (1999-2004) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT THX-DJ5TED.
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
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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