The Audi BEX is a 1,798 cc, inline — four turbocharged petrol engine produced between 2010 and 2016. It features direct fuel injection (TSI), variable valve timing (VVT), and a single — scroll turbocharger, delivering 125 kW (170 PS) and 250 Nm of torque. Its compact design and thermal efficiency make it suitable for transverse mounting in Audi's compact and mid — size platforms.
Fitted to models such as the 8K A3, 8J A4, and 3C A6, the BEX engine was engineered for responsive ur…
Production years 2010–2012 meet Euro 5 standards; 2013–2016 models comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Audi BEX is a 1,798 cc inline-four turbocharged petrol engine engineered for compact and mid-size models (2010–2016). It combines TSI direct injection with variable valve timing to deliver responsive low-end torque and smooth power delivery. Designed to meet Euro 5 and later Euro 6 emissions standards, it balances performance with fuel efficiency.
| 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) @ 5,000–6,200 rpm | |
Torque | 250 Nm @ 1,500–4,500 rpm | |
Fuel system | Bosch HDEV5 direct injection (up to 150 bar) | |
Emissions standard | Euro 5 (pre-2013); Euro 6 (2013–2016) | |
Compression ratio | 9.6:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single-scroll turbo (Honeywell) | |
Timing system | Chain-driven (front-mounted; wear-prone) | |
Oil type | Audi Longlife 01 (SAE 5W-40) | |
Dry weight | 132 kg |
The Audi BEX was used across Audi's 8K/8J platforms with transverse mounting. This engine received platform-specific adaptations-shorter intake manifolds in the 8K A3 and revised cooling routing in the 8J A4-and from 2013 the facelifted 8K FL models adopted the BEX variant with updated chain guides, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The BEX's primary reliability risk is timing chain wear on early builds, with elevated incidence in urban stop-start use. Internal Audi quality reports from 2013 indicated a significant share of pre-2013 engines requiring chain repair before 150,000 km, while UK DVSA records link a notable portion of emissions-related MOT failures to lambda sensor faults 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 (2010–2016) 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 BEX delivers strong performance and good efficiency, but early models (2010–2012) had reliability concerns, especially timing chain failures. Later revisions (post-2013) improved chain durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (5W-40 Audi Longlife 01) greatly aid longevity.
The biggest issues are timing-chain wear (leading to chain rattling or breakage), turbo wastegate actuator sticking, and intake carbon buildup affecting valve operation. Other complaints include oil leaks from gaskets and occasional lambda sensor faults. These are well-documented in Audi service bulletins.
This 2.0L petrol was used across Audi's lineup during the 2010–2016 period. It appeared in the A3 (8K), A4 (8J), and A6 (3C) as the 2.0 TFSI variant. It was phased out in favour of EA888 Gen 3 engines with improved timing systems and emissions control.
Yes. The BEX is tunable. ECU remaps can safely gain +30–50 kW on stage 1, as the stock internals handle increased torque. Aftermarket upgrades (intercooler, exhaust, intake) can further boost performance. Enthusiasts frequently remap A3 and A4 models for improved throttle response. Tuning should be done carefully with supporting modifications.
Good for a turbocharged petrol engine. In an A4 2.0 TFSI (125 kW) from around 2012, typical consumption is ~9.5 L/100km (city) and ~5.8 L/100km (highway), or about 30 mpg UK combined. Real-world figures vary, but expect 30–35 mpg (UK) on mixed roads for a healthy BEX engine.
Yes. The BEX (like most modern Audis) is an interference engine. If the timing chain fails, pistons can strike open valves, causing catastrophic engine damage. That's why chain maintenance is critical—any warning rattles should be addressed immediately.
Audi specifies a 5W-40 synthetic oil meeting Audi Longlife 01 (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
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with AUDI or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialAUDI documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.