The Audi CAHB is a 1,395 cc, inline — four turbocharged petrol engine produced between 2012 and 2016. It belongs to the Volkswagen Group's EA211 engine family, designed for compact and subcompact applications. Featuring a transverse layout, direct fuel injection (TSI), and dual overhead camshafts with variable valve timing, it delivers 81 kW (110 PS) and 200 Nm of torque. Its lightweight construction and thermal efficiency support strong low — end response and real — wor…
Production years 2012–2013 meet Euro 5 standards; 2014–2016 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/6789).
The Audi CAHB is a 1,395 cc inline-four turbocharged petrol engine designed for compact models (2012-2016). It combines TSI direct injection with an integrated exhaust manifold and variable valve timing to deliver responsive low-RPM performance and stable fuel efficiency. Designed to meet Euro 5 and Euro 6 emissions standards, it balances city-friendly drivability with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,395 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (fixed geometry) | |
Bore × stroke | 74.5 mm × 79.5 mm | |
Power output | 81 kW (110 PS) @ 5,000–6,000 rpm | |
Torque | 200 Nm @ 1,500–3,500 rpm | |
Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
Emissions standard | Euro 5 (pre-2014); Euro 6 (2014–2016, market-dependent) | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled, integrated exhaust manifold | |
Turbocharger | Single fixed-geometry turbo (BorgWarner KP35) | |
Timing system | Timing belt (service interval: 120,000 km or 5 years) | |
Oil type | VW 502 00 / 505 00 (SAE 5W-30) | |
Dry weight | 97 kg |
The Audi CAHB was used across Audi's 8X/8V platforms with transverse mounting and shared within the Volkswagen Group for compact applications. This engine received platform-specific adaptations-shorter intake tracts in the A1 and revised EGR routing in the A3-and from 2014 the facelifted A3 8V.5 adopted Euro 6 calibration, creating emissions system incompatibility. Partnerships enabled shared architecture with Volkswagen, Škoda, and SEAT. All adaptations are documented in OEM technical bulletins.
The CAHB's primary reliability risk is timing belt failure due to tensioner degradation, with elevated incidence in vehicles exceeding service intervals. Internal Audi quality reports from 2015 indicated a significant number of pre-2014 units required unscheduled belt replacement before 120,000 km, while UK DVSA records show emissions-related faults dominate MOT failures in high-mileage examples. Extended idling and urban driving increase thermal stress, making adherence to service intervals and coolant system maintenance critical.
Analysis derived from Audi technical bulletins (2012-2016) and UK DVSA failure statistics (2016-2022). 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 CAHB offers good efficiency and responsiveness, but pre-2014 models are prone to timing belt tensioner failure if service intervals are exceeded. Later revisions improved tensioner durability. When maintained with correct oil (VW 502 00/505 00) and timely belt changes, well-cared-for units can exceed 150,000 km. Carbon buildup on intake valves is common and requires periodic cleaning.
Primary issues include timing belt tensioner failure, turbo boost control faults, and intake valve carbon buildup. Coolant leaks from plastic connectors and turbo lines are also frequent. These are documented in Audi service bulletins. Regular maintenance and use of quality coolant significantly reduce failure risk.
The CAHB 1.4 TFSI was used in the Audi A1 (8X) from 2012–2015 and the A3 (8V) from 2013–2016. It was also shared across Volkswagen Group brands, appearing in the Volkswagen Polo (6R), Škoda Fabia (NJ), and SEAT Ibiza (6J). Models from 2014 onward meet Euro 6 emissions standards in applicable markets.
Yes. The CAHB responds well to ECU remapping, with stage 1 tunes typically adding +25-35 kW. Stock internals handle increased torque, but supporting mods like upgraded intercooler and exhaust improve reliability. Tuning may affect emissions compliance and increase carbon buildup risk.
Excellent for a turbo petrol engine. In an A3 1.4 TFSI, combined consumption is ~5.3 L/100km (53 mpg UK). Highway runs can achieve ~4.8 L/100km (58 mpg UK). Real-world mixed driving typically yields 45-50 mpg UK. Economy depends on driving style and transmission choice.
Yes. The CAHB is an interference engine. If the timing belt fails or skips, piston-to-valve contact will occur, causing severe internal damage. The belt is serviceable but must be replaced at 120,000 km or 5 years to prevent catastrophic failure.
Audi specifies VW 502 00 / 505 00 (SAE 5W-30) synthetic oil. Change every 15,000 km or annually. Using correct oil is critical for turbocharger and direct injection system longevity. ACEA A3/B4 oils are acceptable if VW-certified.
Comprehensive technical documentation and regulatory references
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AUDI Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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