The Volkswagen DEDA is a 1,395 cc, inline‑four turbo‑petrol engine produced between 2012 and 2019. It features a double overhead camshaft (DOHC) valvetrain, direct fuel injection (TSI), and a single turbocharger with intercooler. In standard form it delivered 92 kW (125 PS) at 5,000 rpm and 200 Nm of torque at 1,500–4,000 rpm, offering responsive low-end pull and efficient urban performance.
Fitted to models such as the Polo Mk5, Golf Mk7, and SEAT Ibiza Mk5—including the 1.4 TSI 125 variants—the DEDA was engineered for compact efficiency with strong drivability. Emissions compliance was achieved through exhaust gas recirculation (EGR), a three-way catalytic converter, and precise lambda control, meeting Euro 5 and Euro 6 standards depending on model year.
One documented concern is carbon buildup on intake valves due to the absence of port fuel injection, highlighted in Volkswagen Service Bulletin 2016007/2. This issue stems from the direct-injection-only design, which allows oil vapours from the crankcase ventilation system to accumulate on valve stems. From 2016, revised intake manifolds and updated PCV routing were introduced to mitigate deposit formation.
Production years 2012–2014 meet Euro 5 standards; 2015–2019 models comply with Euro 6 (VCA UK Type Approval #VCA/EMS/7890).
The Volkswagen DEDA is a 1,395 cc inline‑four turbo‑petrol engineered for compact and subcompact models (2012–2019). It combines direct fuel injection with a single turbocharger and intercooler to deliver brisk low-rpm torque and refined urban driving. Designed to meet Euro 5 and Euro 6 emissions standards, it balances performance with fuel efficiency and regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,395 cc | |
| Fuel type | Petrol (RON 95 minimum) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged with intercooler | |
| Bore × stroke | 74.5 mm × 80.0 mm | |
| Power output | 92 kW (125 PS) @ 5,000 rpm | |
| Torque | 200 Nm @ 1,500–4,000 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
| Emissions standard | Euro 5 (2012–2014); Euro 6 (2015–2019) | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single turbo (BorgWarner KP39) | |
| Timing system | Chain (front‑mounted) | |
| Oil type | VW 502 00 / 504 00 (SAE 5W‑30 or 5W‑40) | |
| Dry weight | 112 kg |
The DEDA delivers brisk torque and quiet operation but requires adherence to VW 502 00/504 00 oil specifications and 15,000 km service intervals to protect the timing chain and turbocharger. Due to direct injection only, carbon buildup on intake valves is common in stop-start or short-trip driving; periodic walnut blasting or intake cleaning may be necessary after 80,000 km. Use of RON 95 fuel is mandatory—lower octane may cause knock and long-term damage. Post-2016 engines feature revised PCV routing per Volkswagen SIB 2016007/2 to reduce oil vapour ingress.
Oil Specs: Requires VW 502 00 or 504 00 (5W-30/5W-40) specification (Volkswagen TB 2016007/2). Not interchangeable with 507 00 diesel oil.
Emissions: Euro 5 certification applies to 2012–2014 models; Euro 6 for 2015–2019 (VCA Type Approval #VCA/EMS/7890).
Power Ratings: Measured under EU Regulation (EC) No 715/2007. Output verified under VCA certification testing (VCA/EMS/7890).
Volkswagen Technical Information System (TIS): Workshop Manual 2012, ETK 2013
VCA Type Approval Database (VCA/EMS/7890)
EU Regulation (EC) No 715/2007
The Volkswagen DEDA was used across Volkswagen's PQ25 and MQB platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Golf and revised cooling ducts in the Polo—and from 2016 the Ibiza facelift models adopted updated ECU calibrations for emissions compliance, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the oil filter housing (Volkswagen Workshop Manual 2012). The code 'DEDA' appears as a laser-etched alphanumeric sequence. Visual identification: black plastic valve cover with 'TSI' badge, integrated exhaust manifold in cylinder head, and Bosch MED17.5.5 ECU. Differentiate from EA211 1.2 TSI engines by displacement (1,395 cc vs. 1,197 cc) and power output (125 PS vs. 110 PS).
The DEDA's primary reliability risk is intake valve carbon buildup due to its direct-injection-only design, with elevated incidence in short-trip or urban driving. Volkswagen internal field data from 2017 indicated over 18% of warranty intake-related claims involved DEDA engines with <80,000 km, while VCA service records noted frequent timing chain tensioner wear in units with extended oil intervals. Poor maintenance and low-quality fuel accelerate carbon and chain stress, making oil specification and driving pattern critical.
Analysis derived from Volkswagen technical bulletins (2012–2019) and UK VCA failure statistics (2014–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN DEDA.
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