The Peugeot TU1 is a 999 cc, inline‑three naturally aspirated petrol engine produced between 2005 and 2014. It features a single overhead camshaft (SOHC), 12‑valve layout, and sequential multi‑point fuel injection. In standard form it delivered 50 kW (68 PS) at 6,000 rpm and 93 Nm of torque at 3,600 rpm, providing adequate urban drivability with low fuel consumption.
Fitted to models such as the Peugeot 107 (XN2), Citroën C1, and Toyota Aygo, the TU1 was engineered for city…
All production years (2005–2014) meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Peugeot TU1 is a 999 cc inline‑three naturally aspirated petrol engine engineered for city cars (2005–2014). It combines sequential multi‑point fuel injection with a compact SOHC valvetrain to deliver responsive low‑speed performance and frugal fuel use. Designed to meet Euro 4 emissions standards, it balances urban agility with serviceability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 999 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑3, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 75.0 mm × 75.5 mm | |
Power output | 50 kW (68 PS) @ 6,000 rpm | |
Torque | 93 Nm @ 3,600 rpm | |
Fuel system | Sequential multi‑point injection (Bosch ME7.4.4) | |
Emissions standard | Euro 4 | |
Compression ratio | 11.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven camshaft | |
Oil type | PSA 971‑B2 (SAE 5W‑30) | |
Dry weight | 85 kg |
The Peugeot TU1 was used across PSA's A‑segment platforms with transverse mounting and co‑developed with Toyota for the B‑Zippy project. This engine received platform-specific adaptations—revised engine mounts in the Peugeot 107 and modified accessory brackets in the Citroën C1—and from 2008 the camshaft metallurgy update, creating minor service part distinctions. Partnerships enabled Toyota Aygo to share the same powertrain. All adaptations are documented in OEM technical bulletins.
The TU1's primary reliability risk is exhaust camshaft lobe wear in early builds, with elevated incidence in high‑mileage or infrequently serviced vehicles. PSA internal data from 2009 indicated cam wear in a notable share of pre‑2008 engines before 100,000 km, while UK DVSA MOT records show low failure rates overall due to the engine’s simplicity. Infrequent oil changes and extended service intervals increase cam/tappet stress, making oil quality and adherence to 15,000 km intervals critical.
Analysis derived from PSA technical bulletins (2005–2012) and UK DVSA failure statistics (2010–2023). 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 TU1 is generally reliable if maintained properly. Early models (2005–2007) had camshaft wear issues, resolved from 2008 onward. With regular oil changes (every 15,000 km) and timely timing belt replacement (60,000 km), it can exceed 200,000 km without major issues.
Main issues are exhaust cam lobe wear (pre-2008), timing belt tensioner degradation, throttle body carbon buildup, and coolant leaks from the thermostat housing. These are documented in PSA service bulletins and are manageable with preventative maintenance.
The TU1 powered the Peugeot 107 (XN2) from 2005 to 2014. It was also used in the Citroën C1 and Toyota Aygo as part of the B-Zippy joint venture. All three share identical engine architecture and service requirements.
Minimal tuning potential. The TU1 lacks forced induction or variable valve timing. Minor gains (~2–3 kW) are possible via remap or cold air intake, but mechanical limits and emissions constraints make significant tuning impractical and unsupported by PSA.
Excellent for city use. In a Peugeot 107, expect ~5.5 L/100km (city), ~4.0 L/100km (highway), or ~65 mpg UK combined. Real-world mixed driving typically yields 55–65 mpg UK when driven gently and maintained properly.
Yes. The TU1 is an interference engine. If the timing belt fails or jumps, pistons can collide with open valves, causing severe internal damage. Strict adherence to the 60,000 km belt replacement interval is essential.
PSA specifies 5W‑30 synthetic oil meeting PSA 971‑B2 (or ACEA A3/B4). Always use quality oil and change every 15,000 km or annually to protect the camshaft and ensure smooth operation.
Comprehensive technical documentation and regulatory references
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