The Peugeot UKZ (ZPJ4/Z) is a 1,587 cc, inline‑four naturally aspirated petrol engine produced between 2004 and 2010. It features double overhead camshafts (DOHC), 16 valves, and sequential multi — point fuel injection. In standard form, it delivered 80 kW (109 PS) and 145 Nm of torque, engineered for responsive, economical performance in compact vehicles.
Fitted to models such as the 207 and 308, the UKZ engine was designed for agile city driving and efficient motorway c…
Production years 2004–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/6789).
The Peugeot UKZ (ZPJ4/Z) is a 1,587 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks (2004-2010). It combines DOHC 16-valve architecture with sequential multi-point injection to deliver lively, fuel-efficient performance. Designed to meet Euro 4 standards, it prioritizes low running costs and urban agility.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,587 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 78.5 mm × 82.0 mm | |
Power output | 80 kW (109 PS) @ 5,800 rpm | |
Torque | 145 Nm @ 4,000 rpm | |
Fuel system | Sequential multi-point injection (SAGEM) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven | |
Oil type | Peugeot 9736.10 (SAE 5W‑40) | |
Dry weight | 112 kg |
The Peugeot UKZ (ZPJ4/Z) was used across Peugeot's PF1/PF2 platforms with transverse mounting. This engine received minor ECU mapping adaptations for different model weights but no major facelift revisions affected core compatibility. All adaptations are documented in OEM technical bulletins.
The UKZ's primary reliability risk is cracking of the plastic intake manifold, with elevated incidence in higher-mileage or older examples. Peugeot internal service data indicated a common failure point, while UK DVSA records show associated rough running as a frequent MOT advisory item. Thermal stress makes proactive inspection and timely replacement critical.
Analysis derived from Peugeot technical bulletins (2005-2009) and UK DVSA failure statistics (2012-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The UKZ is a fundamentally simple and robust engine if basic maintenance is followed. The main concerns are the plastic intake manifold and the critical 60,000 km timing belt change. With these addressed, and regular oil changes, these engines can reliably reach 200,000 km or more.
The most frequent issues are cracking plastic intake manifolds causing vacuum leaks, timing belt failure due to neglected replacement, failing ignition coils causing misfires, and carbon buildup in the throttle body. These are well-documented in Peugeot service information.
The UKZ engine was primarily used in the Peugeot 207 (2006-2010) and 308 (2007-2010). It was also shared with Citroën, appearing in the C4 (2004-2010) as the 1.6i 16V. It's a transverse-mounted engine for front-wheel-drive platforms.
Modest gains are possible. An ECU remap can yield around +8-12 kW by optimizing ignition and fuel maps. More significant power requires hardware like a performance exhaust or intake, which offers limited returns. It's better suited to reliability than aggressive tuning.
Fuel economy is very good for its era. In a Peugeot 207 1.6i, expect around 7.5 L/100km in the city and 5.0 L/100km on the highway, averaging approximately 45-50 mpg UK combined. Real-world figures vary with driving style.
Yes. The UKZ is an interference engine. If the timing belt fails, the pistons will collide with the open valves, causing severe and expensive internal engine damage. This makes the 60,000 km belt change interval absolutely critical.
Peugeot mandates oil meeting their 9736.10 specification, typically a 5W-40 synthetic or semi-synthetic. Using the correct oil is important for engine longevity. Always check the oil cap or owner's manual for the exact specification.
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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