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 .
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 | Refer to vehicle handbook / manufacturer specification | |
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.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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.
Aftermarket ECU tuning is common on the BEX platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
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
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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
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VCA Certification Portal
Type-approval guidance and documentation.
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