The Volkswagen CBAC is a 1,390 cc, inline‑four turbocharged petrol engine produced between 2008 and 2015. It features gasoline direct injection (TSI), a single turbocharger, and dual overhead camshafts (DOHC). This engine was part of VW's effort to downsize while maintaining performance, delivering outputs around 90 kW (122 PS) and 200 Nm of torque.
Fitted primarily to the Mk5 and Mk6 Golf, as well as the Polo and Scirocco, the CBAC was engineered for responsive urban dri…
Production years 2008–2015 meet Euro 5 standards .
The Volkswagen CBAC is a 1,390 cc inline‑four turbocharged petrol engine engineered for compact hatchbacks and coupes (2008-2015). It combines gasoline direct injection (TSI) with a single turbocharger to deliver responsive power and good fuel efficiency. Designed to meet Euro 5 standards, it balances everyday drivability with modern emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,390 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 76.5 mm × 75.6 mm | |
Power output | 90 kW (122 PS) | |
Torque | 200 Nm @ 1,500–3,500 rpm | |
Fuel system | Gasoline direct injection (TSI) | |
Emissions standard | Euro 5 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single turbocharger (IHI or Garrett) | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | Approx. 110 kg |
The Volkswagen CBAC was used across Volkswagen's Mk5/Mk6 platforms with transverse mounting. This engine received minor ECU and ancillary updates during its lifecycle, but core mechanical compatibility remains high across its applications. All adaptations are documented in OEM technical bulletins.
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The CBAC's primary reliability consideration is intake valve carbon buildup, a common trait in early direct-injection engines. While not typically causing catastrophic failure, it can lead to drivability issues and increased fuel consumption. Extended oil change intervals and frequent short trips can accelerate this process, making preventative maintenance critical.
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 CBAC is generally robust with proper maintenance. Its main long-term concern is carbon buildup on intake valves, which is manageable with periodic cleaning. The timing chain is durable. Using the correct oil and adhering to service intervals are key to longevity.
The most frequent issues are carbon buildup on intake valves, high-pressure fuel pump (HPFP) failures, and ignition coil/spark plug wear. Water pump and thermostat failures are also common but are typical wear items for this generation of VW engines.
The CBAC 1.4 TSI (122 PS) was used in the Volkswagen Golf Mk5 (2008-2009), Golf Mk6 (2009-2013), Polo Mk5 (2009-2014), and Scirocco Mk3 (2008-2015). It was a popular engine for its balance of performance and efficiency.
Aftermarket ECU tuning is common on the CBAC 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.
Official combined figures are around 5.7 L/100km (50 mpg UK). Real-world economy varies: expect 6.5-7.5 L/100km (38-43 mpg UK) in mixed driving, with highway figures closer to 5.0 L/100km (56 mpg UK) if driven gently.
Yes. The CBAC is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing severe internal engine damage. Fortunately, the chain is very reliable.
Volkswagen specifies oil meeting VW 502 00 or 504 00 standards, typically SAE 5W-30. Using the correct specification is crucial for engine and turbocharger protection, especially if following extended service intervals.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
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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