The Volkswagen CMSB is a 1,395 cc, inline‑four turbocharged petrol engine produced between 2012 and 2020. It features direct fuel injection (TSI), dual overhead camshafts (DOHC), and variable valve timing, delivering 92 kW (125 PS) and 200 Nm of torque. Its compact turbocharged design enables responsive urban driving with reduced fuel consumption.
Fitted to models such as the Mk7 Golf, Jetta, Passat B8, and Škoda Octavia III, the CMSB was engineered for efficiency — foc…
All production years 2012–2020 meet Euro 6 standards .
The Volkswagen CMSB is a 1,395 cc inline‑four turbocharged petrol engine engineered for compact and mid‑size models (2012–2020). It combines gasoline direct injection (TSI) with a single turbocharger to deliver responsive low‑end torque and fuel-efficient cruising. Designed to meet Euro 6 emissions standards, it balances urban agility with long-distance refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,395 cc | |
Fuel type | Petrol (RON 95 min, RON 98 recommended) | |
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 @ 1,400–4,000 rpm | |
Fuel system | Bosch HDP5 high-pressure direct injection (up to 110 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled with dual-circuit layout | |
Turbocharger | Single turbo (Honeywell TD025) | |
Timing system | Chain-driven DOHC | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 112 kg |
The Volkswagen CMSB was used across Volkswagen's Mk7/B8 platforms with transverse mounting and shared within the Volkswagen Group. This engine received platform-specific ECU calibrations—revised torque curves in the Passat B8 and enhanced thermal management in the Golf Mk7—and from 2016 minor PCV updates were implemented, creating service part distinctions. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 CMSB is generally reliable with proper maintenance. Its main issue is carbon buildup on intake valves, especially in short-trip driving. Using RON 95+ fuel, VW 502 00 oil, and occasional highway driving greatly improves longevity. Many examples exceed 180,000 km with no major failures.
Top issues include intake valve carbon deposits, turbo actuator faults, and occasional HPFP wear. Timing chain problems are rare. Carbon buildup is well-documented in Volkswagen STB 2015‑09 and is the most frequent service need.
The CMSB powered the Golf Mk7 (2012–2020), Jetta A6 (2013–2018), Passat B8 (2014–2020), Škoda Octavia III, and select Audi A3 (8V) models in Europe—all with 1.4 TSI 125 PS output.
Aftermarket ECU tuning is common on the CMSB platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Real-world consumption is ~7.2 L/100km (city) and ~5.1 L/100km (highway), or ~42 mpg UK combined. Aggressive driving pushes this to 8–9 L/100km. Using RON 98 and smooth driving can improve economy slightly.
Yes. The CMSB is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, chain failures are extremely rare; the system is durable with proper oil maintenance.
Volkswagen specifies 5W‑40 synthetic oil meeting VW 502 00 (petrol) or 505 00 (petrol/diesel) standards. Do not use Longlife (504/507) oils. Change every 15,000 km or annually to protect the turbo and fuel system.
Comprehensive technical documentation and regulatory references
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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
Type-approval guidance and documentation.
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