The Audi CBAA is a 1,798 cc, inline — four turbocharged petrol engine produced between 2012 and 2018. It forms part of the EA888 Gen 3 engine family, featuring direct fuel injection (FSI/TSI), variable valve timing (VVT), and an integrated exhaust manifold for improved thermal efficiency. In standard tune it delivered 125 kW (170 PS) with 250 Nm of torque, balancing responsiveness and fuel economy for mainstream applications.
Fitted to models such as the 8V A3, B8/B8.5 A4,…
Production years 2012–2015 meet Euro 5 standards; 2016–2018 models comply with Euro 6b depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Audi CBAA is a 1,798 cc inline-four turbocharged petrol engine engineered for compact and mid-size platforms (2012–2018). It combines direct fuel injection with variable valve timing to deliver responsive performance and stable fuel economy. Designed to meet Euro 5 and later Euro 6b standards, it balances real-world usability with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,798 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 82.5 mm × 84.5 mm | |
Power output | 125 kW (170 PS) @ 5,100–6,000 rpm | |
Torque | 250 Nm @ 1,500–4,500 rpm | |
Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
Emissions standard | Euro 5 (2012–2015); Euro 6b (2016–2018) | |
Compression ratio | 9.6:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single-scroll turbo with integrated exhaust manifold | |
Timing system | Chain-driven (early tensioner wear risk) | |
Oil type | Audi Longlife 04 (5W-30 or 5W-40) | |
Dry weight | 135 kg |
The Audi CBAA was used across Audi's 8V/B8 platforms with longitudinal mounting and shared architecture within the Volkswagen Group. This engine received platform-specific adaptations-integrated starter-generator in the A3 e-tron and revised cooling paths in the Q3-and from 2016 the facelifted B8.5 A4 adopted updated emissions calibration, creating software compatibility limits. All adaptations are documented in OEM technical bulletins.
The CBAA's primary reliability risk is timing chain tensioner wear on early builds, with elevated incidence in urban driving cycles. Internal Audi quality reports from 2015 indicated a significant share of pre-2016 engines exhibiting chain noise before 150,000 km, while UK DVSA data links a portion of emissions-related failures to turbo actuator faults in high-mileage units. Short-trip usage and delayed oil changes increase stress on the tensioner, making adherence to service intervals critical.
Analysis derived from Audi technical bulletins (2014-2018) and UK DVSA failure statistics (2016-2023). 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 CBAA is generally robust when maintained properly, though early models (2012–2015) are prone to timing chain tensioner wear. Post-2016 revisions improved durability. Regular oil changes with Audi Longlife 04 spec oil every 15,000 km are essential. With proper care, 200,000+ km reliability is achievable.
Key issues include timing chain tensioner wear (especially pre-2016), turbo actuator sticking, intake valve carbon buildup, and valve cover oil leaks. These are documented in Audi service bulletins and field reports. Carbon cleaning and tensioner upgrades significantly improve longevity.
The CBAA powered the Audi A3 (8V), A4 (B8/B8.5), and Q3 (8U) from 2012–2018 as the 35 TFSI variant. It was also used in the A3 Sportback e-tron PHEV (2014–2016). All applications feature longitudinal mounting and EA888 Gen 3 architecture.
Yes. The CBAA responds well to ECU remapping, with safe gains of +30–40 kW on stage 1. Stock internals support moderate tuning, but upgraded cooling and fueling are recommended for higher outputs. Reputable tuners offer maps that retain OEM safety thresholds.
In real-world mixed driving, expect 6.5–7.5 L/100km (38–43 mpg UK). Highway efficiency improves to ~5.8 L/100km (~49 mpg UK). The A3 35 TFSI achieves best economy due to lower weight. Driving style and maintenance significantly affect consumption.
Yes. The CBAA is an interference engine. If the timing chain fails or jumps, piston-to-valve contact will occur, causing severe internal damage. Immediate attention to timing chain noise is critical to avoid costly repairs.
Audi specifies 5W-30 or 5W-40 oil meeting Audi Longlife 04 standard. Use only VW 502 00/505 00-compliant oils. Change every 15,000 km or annually to ensure proper tensioner operation and prevent chain wear.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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