The Audi CAHA is a 1,395 cc, inline — four turbocharged petrol engine produced between 2012 and 2018. Part of the EA211 engine family, it features a transverse mounting layout, four valves per cylinder, and a timing chain — driven DOHC valvetrain. In standard tune it delivers 110 kW (150 PS) with 250 Nm of torque, achieving strong low — end responsiveness and high specific output through turbocharging and direct injection.
Fitted to the Audi A1 (8X), A3 (8V), and TT (8S) platfo…
All CAHA engines comply with Euro 5b emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Audi CAHA is a 1,395 cc inline-four turbocharged petrol engine developed for transverse applications in compact and sport models (2012-2018). It combines turbocharging with direct fuel injection (TFSI) to deliver strong specific output and immediate throttle response. Designed to meet Euro 5b standards, it balances performance with real-world fuel economy in urban and mixed driving.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,395 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 74.5 mm × 79.5 mm | |
Power output | 110 kW (150 PS) @ 5,000–6,000 rpm | |
Torque | 250 Nm @ 1,500–3,500 rpm | |
Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
Emissions standard | Euro 5b | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single-scroll turbo (BorgWarner KP35) | |
Timing system | Roller chain (front-mounted, dual-row) | |
Oil type | Audi Longlife-01 (5W-30) | |
Dry weight | 97 kg |
The Audi CAHA was used across Audi's 8X/8V platforms with transverse mounting and shared architecture with Volkswagen Group derivatives. This engine received platform-specific adaptations-shorter intake manifolds in the A1 and revised cooling routing in the TT-and from 2014 the facelifted A3 8V.5 adopted updated timing chain tensioner geometry, creating software compatibility limits. All adaptations are documented in OEM technical bulletins.
The CAHA's primary reliability risk is timing chain tensioner wear, with elevated incidence in mixed urban/highway use. Internal Audi quality reports from 2016 indicated a notable share of pre-2014 units requiring tensioner replacement before 120,000 km, while UK DVSA records show a significant portion of emissions-related MOT failures linked to lambda sensor faults in stop-start conditions. Use of substandard oil and extended service intervals increase chain and turbo stress, making oil quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2012-2018) and UK DVSA failure statistics (2018-2023). 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 CAHA is generally robust when maintained properly, but pre-2014 models are prone to timing chain tensioner wear. Later revisions with updated tensioners and oil pump calibration improved reliability. Regular servicing, use of high-octane petrol (RON 95), and timely oil changes (15,000 km max) are essential for longevity.
Key issues include timing chain tensioner wear, intake valve carbon buildup, turbo wastegate sticking, and valve cover oil leaks. These are documented in Audi service bulletins. Oil quality and maintenance intervals significantly impact failure rates.
The CAHA was used in the Audi A1 (8X), A3 (8V), and Q2 (8YA) from 2012 to 2018. It powered the 1.4 TFSI 150 PS variants. All models require premium unleaded and specific service procedures.
Yes. The CAHA responds well to ECU remapping, typically gaining 30-50 PS safely. Stock internals handle increased torque, but supporting mods (intercooler, exhaust) improve reliability. Tuning should be done by specialists familiar with EA211 engine management.
Excellent. In an A3 1.4 TFSI, combined consumption is ~5.4 L/100km (~52 mpg UK). Highway driving can achieve ~4.8 L/100km (~59 mpg UK). Real-world figures depend on driving style, but 45-55 mpg UK is typical for well-maintained units.
Yes. The CAHA is an interference engine. If the timing chain fails or jumps, pistons can strike valves, causing catastrophic internal damage. Immediate attention to chain rattle or oil pressure warnings is critical to avoid engine replacement.
Audi specifies 5W-30 synthetic oil meeting Longlife-01 (or newer) standards. Change intervals should not exceed 15,000 km or 1 year. Proper oil ensures fuel pump lubrication, chain tensioner function, and turbo longevity.
Comprehensive technical documentation and regulatory references
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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)
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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.
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