The Audi BUG is a 1,798 cc, inline-four turbocharged petrol engine produced between 2013 and 2020. It belongs to the EA888 Gen 3 engine family, featuring direct fuel injection (TSI), dual overhead camshafts (DOHC), and variable valve timing on both intake and exhaust camshafts. In standard tune it delivered 125 kW (170 PS), with peak torque of 250 Nm available from 1,500 rpm, providing strong mid-range responsiveness.
Fitted to models such as the 8V A3, 8S S3, and B8.5 A4, the BUG engine was engineered for a balance of efficiency and sporty character in compact and mid-size applications. Its driving character emphasizes linear power delivery and smooth throttle response. Emissions compliance was achieved through a three-way catalytic converter and lambda control system, meeting Euro 5 standards for all production years.
One documented concern is high-pressure fuel pump (HPFP) wear under aggressive driving or extended service intervals. This issue, referenced in Audi Service Information Bulletin 2015-12-01, can lead to lean mixture faults and misfires. From 2016, revised fuel pump calibration and updated injector control strategies were introduced to improve durability.
Production years 2013–2020 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/6780).
The Audi BUG is a 1,798 cc inline-four turbocharged petrol engine developed for transverse-mounted applications (2013–2020). It combines TSI direct injection with dual VVT to deliver responsive mid-range torque and refined performance. Designed to meet Euro 5 emissions, it balances everyday drivability with sporty characteristics in Audi's compact and executive lineups.
| 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) @ 4,500–6,200 rpm | |
| Torque | 250 Nm @ 1,500–3,500 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 9.6:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single-scroll turbo (IHI) | |
| Timing system | Chain-driven (front-mounted; low wear under proper maintenance) | |
| Oil type | VW 502 00 / 505 00 (SAE 5W-30) | |
| Dry weight | 135 kg |
The BUG's turbocharged design provides strong mid-range torque ideal for spirited driving, but requires adherence to 15,000 km or annual oil changes using VW 502 00 (5W-30) specification to protect the HPFP and turbocharger. The Bosch HDEV5 fuel system is sensitive to fuel quality and benefits from regular use of RON 98 fuel to prevent pre-ignition and injector coking. Extended idling and short trips increase carbon buildup on intake valves due to absence of port injection. Post-2016 models feature improved fuel pump calibration; pre-2016 units benefit from the updated control software per Audi SIB 2015-12-01. PCV system maintenance is essential to prevent oil consumption and crankcase pressure issues.
Oil Specs: Requires VW 502 00 / 505 00 (5W-30) specification (Audi SIB 2015-12-01). Supersedes ACEA A3/B4 standards.
Emissions: Euro 5 certification applies to all production years (2013–2020) (VCA Type Approval #VCA/EMS/6780).
Power Ratings: Measured under SAE J1349 standards. 125 kW output requires RON 95 fuel quality (Audi TIS Doc. A34301).
Audi Technical Information System (TIS): Docs A34023, A34107, A34212, SIB 2015-12-01
VCA Type Approval Database (VCA/EMS/6780)
SAE International: J1349 Engine Power Certification Standards
The Audi BUG was used across Audi's 8V/8S/B8.5 platforms with transverse mounting and shared architecture with Volkswagen and SEAT for modular applications. This engine received platform-specific adaptations-shorter intake manifolds in the S3 and revised cooling routing in the A4-and from 2016 received minor ECU updates to improve fuel system reliability, creating partial interchange limits. Partnerships within the VW Group allowed shared use of the EA888 Gen 3 architecture. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the transmission bellhousing (Audi TIS A34092). The 8th VIN digit indicates engine family ('C' for EA888 series). Pre-2016 models have a silver valve cover with black plastic cam cover; post-2016 units use all-black covers. Critical differentiation from EA888 Gen 2: BUG uses a Bosch HDEV5 fuel system with 200 bar pressure and revised turbo actuator. Service parts require production date verification—fuel pumps for engines before 06/2016 are incompatible with later units due to control software updates (Audi SIB 2015-12-01).
The BUG's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in performance-oriented use. Internal Audi quality reports from 2016 indicated a notable share of pre-2016 engines requiring fuel pump replacement before 130,000 km, while UK DVSA records show increased catalytic converter failures linked to lean-running conditions in high-mileage units. Frequent high-RPM operation and extended oil intervals increase fuel system stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2014-2017) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI BUG.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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