The Audi CBAB is a 1,984 cc, inline — four petrol engine produced between 2008 and 2013. It features turbocharging, direct fuel injection (FSI/TFSI), and dual overhead camshafts (DOHC), delivering responsive performance across Audi's compact and mid — size lineup. In standard tune, it produces 125 kW (170 PS) with peak torque of 280 Nm available from 1,750 rpm.
Fitted to platforms including the 8P A3, 8J A4, and Typ 53 RS3, the CBAB engine was engineered for balanced perform…
Production years 2008–2009 meet Euro 5 standards; 2010–2013 models comply with Euro 5b (EURO Vb) depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Audi CBAB is a 1,984 cc inline-four turbocharged petrol engine engineered for compact and mid-size Audi models (2008–2013). It combines turbocharging with fuel stratified injection (TFSI) to deliver responsive low-end torque and linear power delivery. Designed to meet Euro 5 emissions standards, it balances sporty performance with moderate fuel consumption.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,984 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 125 kW (170 PS) @ 4,300–6,000 rpm | |
Torque | 280 Nm @ 1,750–4,200 rpm | |
Fuel system | Bosch HDEV5 direct injection (up to 150 bar) | |
Emissions standard | Euro 5 / Euro 5b | |
Compression ratio | 9.6:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single BorgWarner KP35 turbocharger | |
Timing system | Chain-driven (rear-mounted; tensioner wear concern) | |
Oil type | Audi Longlife-04 (SAE 5W-30) | |
Dry weight | 142 kg |
The Audi CBAB was used across Audi's 8P/8J platforms with transverse and longitudinal mounting. This engine received platform-specific adaptations-shorter intake manifolds in the 8P A3 and revised cooling routing in the 8J A4-and from 2011 the facelifted 8J A4 B8.5 models adopted updated chain tensioners, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CBAB's primary reliability risk is timing chain tensioner wear on early builds, with elevated incidence in urban driving cycles. Internal Audi quality reports from 2012 indicated a notable share of pre-2011 engines requiring chain repair before 150,000 km, while UK DVSA records link a significant portion of emissions-related MOT failures to EGR clogging in city-driven vehicles. Cold-start cycles and extended idling increase chain and guide stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2009-2014) and UK DVSA failure statistics (2015-2023). 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 CBAB delivers strong performance and responsiveness, but early models (2008–2010) had reliability concerns, particularly timing chain failures. Later revisions (post-2011) improved chain durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (5W-30 Audi Longlife-04) greatly aid longevity.
The biggest issues are timing-chain wear (leading to rattle or breakage), turbo actuator failures, and intake carbon buildup affecting EGR and swirl flaps. Other complaints include oil leaks from gaskets and occasional injector faults. These are well-documented in Audi service bulletins and technical reports.
This 2.0L TFSI engine was used in several Audi models including the 8P A3, 8J A4, and 8P S3. It also shares core architecture with the 2.5 TFSI in the Typ 53 RS3. Applications span 2008–2013, primarily in Euro 5-compliant vehicles. It was not used outside the Audi/VW Group.
Yes. The CBAB is highly tunable. ECU remaps safely gain +30–50 kW on stage 1, as the stock internals handle torque well. Aftermarket upgrades (larger turbo, intercooler, exhaust) can push power further. Enthusiasts frequently remap S3 and A4 models for sharper response. Tuning should be done carefully with supporting mods to avoid overstressing components.
Moderate. In an A4 2.0 TFSI (125 kW) from 2010, typical consumption is ~9.5 L/100km (city) and ~6.0 L/100km (highway), or about 38 mpg UK combined. Real-world figures depend on driving style, but expect 35–45 mpg (UK) on mixed roads for a healthy CBAB. Turbo efficiency improves highway economy.
Yes. The CBAB series is an interference engine. If the timing chain jumps or breaks, pistons can collide with open valves, causing catastrophic engine damage. That's why chain maintenance is critical—any rattling at startup should be investigated immediately.
Audi specifies a 5W-30 synthetic oil meeting Audi Longlife-04 (or newer) spec. Always use a quality oil designed for turbocharged petrol engines and change it every 15,000 km or as Audi recommends to ensure proper chain lubrication and minimize carbon buildup.
Comprehensive technical documentation and regulatory references
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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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
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