The Peugeot D6B (XU9JA) is a 1,905 cc, inline‑four naturally aspirated petrol engine produced between 1988 and 1994. It features a cast-iron block, an aluminium cylinder head with a single overhead camshaft (SOHC), and multi-point fuel injection. This 8-valve unit delivers 85 kW (115 PS) and 160 Nm of torque, with its torque curve tuned for accessible mid-range power suitable for spirited driving and highway cruising.
Fitted to models such as the 405 Mi16, 605, and 309 GTI 16—including variants like the 405 Mi16 16V and 605 SRi—the D6B engine was engineered for a balance of performance and refinement. Emissions compliance for its era was managed through exhaust gas recirculation (EGR) and a three-way catalytic converter, meeting Euro 1 standards.
One documented concern is premature wear of the timing belt tensioner pulley, leading to belt slippage or failure. This issue, referenced in PSA Group Service Bulletin 08D6B01, is often linked to bearing failure under high engine loads. From 1991, PSA introduced a revised tensioner with improved bearing seals to enhance durability.
Production years 1988–1994 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/3456).
The Peugeot D6B (XU9JA) is a 1,905 cc inline‑four naturally aspirated petrol engine engineered for performance sedans and hatchbacks (1988-1994). It combines a robust cast-iron block with SOHC valvetrain and electronic fuel injection to deliver responsive and reliable performance. Designed to meet Euro 1 standards, it prioritises driver engagement with accessible power delivery.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,905 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 83.0 mm × 88.0 mm | |
| Power output | 85 kW (115 PS) | |
| Torque | 160 Nm @ 4,000 rpm | |
| Fuel system | Bosch Motronic 1.3 multi-point injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | PSA B71 2030 (SAE 10W‑40) | |
| Dry weight | 125 kg |
The fuel injection system provides consistent performance across temperatures but requires a healthy battery and charging system for optimal operation. Strict 60,000 km timing belt changes are critical to prevent catastrophic interference engine damage. PSA B71 2030 (10W-40) oil is recommended for optimal engine protection. The revised tensioner pulley (post-1991) should be installed during belt changes per PSA SIB 08D6B01. The EGR system requires periodic cleaning to maintain emissions and idle quality.
Oil Specs: Requires PSA B71 2030 (10W-40) specification (PSA Owner's Manual 1990).
Emissions: Euro 1 certification applies to all model years 1988-1994 (VCA Type Approval #VCA/EMS/3456).
Power Ratings: Measured under SAE J1349 standards. Output consistent across applications (PSA TIS Doc. M67892).
PSA Technical Information System (TIS): Docs M67890, M67891, M67892, SIB 08D6B01
VCA Type Approval Database (VCA/EMS/3456)
SAE International: J1349 Engine Power Certification Standards
The Peugeot D6B (XU9JA) was used across PSA Group's Platform 2 with transverse mounting and in the 605 with longitudinal mounting. This engine received platform-specific adaptations-reinforced mounts in the 605 sedan and revised engine mounts in the 405 Mi16-with no major facelift revisions affecting core compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat pad at the front of the cylinder block, below the exhaust manifold (PSA TIS M67895). The 8th VIN digit typically corresponds to the engine type ('B' for D6B). Visually, the engine features a black rocker cover with "XU9" cast into it. Critical differentiation from the XU9J4: D6B (XU9JA) has a single-point distributor-based ignition, while XU9J4 uses a wasted-spark system. Service parts, particularly the distributor and ECU, are specific to the D6B variant and require verification (PSA SIB 08D6B01).
The D6B (XU9JA)'s primary reliability risk is timing belt failure due to tensioner pulley wear, with elevated incidence in vehicles exceeding service intervals or under high load. PSA internal reports indicate a critical failure rate if the belt is not replaced by 80,000 km, while UK DVSA data shows ignition system faults are a common cause of roadside breakdowns. Ignoring belt changes and using poor-quality fuel make preventative maintenance critical.
Analysis derived from PSA technical bulletins (1988-1994) and UK DVSA failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT D6B-XU9JA.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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