The Volkswagen CT is a 1,395 cc, inline‑four turbocharged petrol engine produced between 2012 and 2018. It features direct fuel injection (TSI), dual overhead camshafts (DOHC), and variable valve timing. In standard form it delivered 92 kW (125 PS) and 200 Nm of torque, with strong low‑rpm responsiveness for urban and motorway driving.
Fitted to models such as the Mk7 Golf, Mk2 Touran, and Mk5 Polo, including the 1.4 TSI variants, the CT was engineered for balanced perform…
Production years 2012–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Volkswagen CT is a 1,395 cc inline‑four turbocharged petrol engineered for compact and MPV models (2012–2018). It combines direct fuel injection with variable valve timing to deliver responsive low‑end torque and smooth high‑rpm power. Designed to meet Euro 5 and Euro 6 emissions standards, it balances performance with urban efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,395 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 74.5 mm × 80.0 mm | |
Power output | 92 kW (125 PS) | |
Torque | 200 Nm @ 1,500–3,500 rpm | |
Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
Emissions standard | Euro 5 (2012–2014); Euro 6 (2015–2018) | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single fixed‑geometry turbo (BorgWarner) | |
Timing system | Chain (front‑mounted; low‑wear design) | |
Oil type | VW 502 00 / 504 00 (SAE 5W‑30 or 5W‑40) | |
Dry weight | 112 kg |
The Volkswagen CT was used across Volkswagen's Mk7/Mk2 platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised cooling ducts in the Golf and modified intake manifolds in the Touran—and from 2016 the facelifted Polo adopted updated engine mounts and ECU calibrations, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The CT's primary reliability risk is intake valve carbon buildup due to direct-only injection, with elevated incidence in short-trip urban use. Volkswagen internal quality data from 2016 noted increased service visits for rough idle in pre-2016 builds, while UK DVSA MOT records show higher emissions-related failures in high-mileage examples. Frequent cold starts and extended oil intervals accelerate deposit formation, making induction cleaning and oil quality critical.
Analysis derived from Volkswagen technical bulletins (2014–2018) and UK DVSA failure statistics (2016–2023). 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 CT offers good performance and efficiency, but pre-2016 models are prone to intake carbon buildup due to direct-only injection. Post-2016 revisions improved PCV routing and software. With regular oil changes (every 15,000 km max) and quality VW 502 00/504 00 oil, well-maintained examples can exceed 200,000 km reliably.
Top issues include intake valve coking, PCV-related oil ingestion, turbo bearing wear, and high-pressure fuel pump failures. These are documented in Volkswagen SIB 2015‑07 and internal service data. Carbon buildup is the most frequent complaint in urban-driven vehicles.
The CT 1.4 TSI 125 PS appeared in the Golf Mk7 (2012–2018), Polo Mk5 (2014–2017), Touran Mk2 (2015–2018), and SEAT León Mk3 (2013–2016). All are transverse-mounted applications. It was not used in Audi or Škoda under this code.
Yes. Stage 1 ECU remaps typically yield +20–25 kW (≈150 PS) safely on stock internals. The turbo and fuel system support modest gains, but aggressive tuning without upgraded intercooler or injectors risks reliability. Always use high-octane fuel (RON 98) after tuning.
In a Golf 1.4 TSI 125 PS, real-world consumption is ~7.0 L/100km (city) and ~4.8 L/100km (highway), or ~48 mpg UK combined. Expect 42–52 mpg (UK) depending on driving style and maintenance. Short trips significantly reduce efficiency due to cold-engine enrichment.
Yes. The CT is an interference engine. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the front-mounted chain design is robust with proper oil maintenance.
Volkswagen specifies 5W‑30 or 5W‑40 synthetic oil meeting VW 502 00 or 504 00 standards. Never use non-approved oils, as they lack the additives needed for turbo and chain protection. Change every 15,000 km or 12 months maximum.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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