The Volkswagen CUSA is a 1,395 cc, inline‑four turbocharged petrol engine produced between 2015 and 2020. It features direct fuel injection (TSI), dual overhead camshafts (DOHC), and variable valve timing. In standard form it delivers 92 kW (125 PS) and 200 Nm of torque, optimized for urban efficiency and responsive low‑end performance.
Fitted to compact models such as the Polo Mk6, T — Cross, and Škoda Kamiq, the CUSA was engineered for entry‑level TSI performance with s…
All production years 2015–2020 meet Euro 6b emissions standards (VCA UK Type Approval #VCA/EMS/5432).
The Volkswagen CUSA is a 1,395 cc inline‑four turbocharged petrol engineered for compact hatchbacks and SUVs (2015–2020). It combines direct fuel injection (TSI) with a small fixed‑geometry turbo to deliver brisk low‑rpm response and efficient urban driving. Designed to meet Euro 6b standards, it balances affordability with modern emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,395 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 74.5 mm × 80.0 mm | |
Power output | 92 kW (125 PS) @ 5,000 rpm | |
Torque | 200 Nm @ 2,000–3,500 rpm | |
Fuel system | Bosch HDP5 high-pressure direct injection (up to 350 bar) | |
Emissions standard | Euro 6b | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled with dual-circuit thermostat | |
Turbocharger | Single fixed‑geometry turbo (Honeywell) | |
Timing system | Chain (front‑mounted; low wear design) | |
Oil type | VW 504 00 / 507 00 (SAE 5W‑30) | |
Dry weight | 112 kg |
The Volkswagen CUSA was used across Volkswagen's PQ36/MQB A0 platforms with transverse mounting and shared with Škoda and SEAT under the MQB architecture. This engine received platform-specific adaptations—revised engine mounts in the T-Cross and intake tuning in the Polo—and from 2018 the Kamiq adopted updated cam follower hardware, creating minor service part interchange limits. Partnerships allowed Škoda Kamiq and SEAT Arona to use identical CUSA units. All adaptations are documented in OEM technical bulletins.
The CUSA's primary reliability risk is high-pressure fuel pump cam follower wear under suboptimal oil conditions, with elevated incidence in high-mileage or infrequently serviced vehicles. Volkswagen internal field data (2019) indicated HPFP-related faults in a measurable subset of engines exceeding 100,000 km without proper maintenance, while UK DVSA MOT data shows low emissions failure rates due to robust Euro 6b compliance. Extended oil intervals and incorrect oil specs increase cam lobe and follower degradation, making oil specification adherence critical.
Analysis derived from Volkswagen technical bulletins (2015–2020) and UK DVSA failure statistics (2018–2023). 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 CUSA is generally reliable when maintained properly. Key concerns include HPFP cam follower wear and carbon buildup, but these are manageable with correct oil (VW 504 00/507 00), timely servicing, and RON 95+ fuel. Well-maintained examples often exceed 180,000 km without major issues.
Most frequent issues are HPFP cam follower wear, intake valve carbon deposits, PCV diaphragm rupture in the cam cover, and coolant housing leaks. All are documented in Volkswagen service bulletins, particularly STB 2042875/1, and are preventable with proper maintenance.
The CUSA appears in the Polo Mk6, T-Cross, Škoda Kamiq, and SEAT Arona (2017–2020) as the 1.4 TSI 125 PS variant. It was developed for the MQB A0 platform and is not used in larger MQB models like the Golf or Tiguan.
Yes. Stage 1 ECU remaps typically yield +15–20 kW (145–150 PS) safely on stock internals. The engine responds well to tuning due to its robust turbo and low compression ratio. However, aggressive tuning without upgraded fueling may accelerate HPFP or cam follower wear.
Excellent for a turbo petrol. In a Polo 1.4 TSI, expect ~6.2 L/100km (city) and ~4.5 L/100km (highway), or ~55 mpg UK combined. Real-world mixed driving typically returns 50–58 mpg (UK), depending on conditions and driving style.
Yes. Like all modern VW petrol engines, the CUSA is an interference design. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. The front-mounted chain is durable with proper oil maintenance.
Volkswagen mandates 5W-30 synthetic oil meeting VW 504 00 and 507 00 specifications. This low-SAPS oil protects the turbo, HPFP, and emissions systems. Never use older 502/505 oils or non-approved substitutes.
Comprehensive technical documentation and regulatory references
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