The Audi ALT is a 1,781 cc, inline — four petrol engine produced between 1997 and 2002. It belongs to Audi's EA113 engine family, featuring a DOHC 16 — valve configuration and sequential multi — point fuel injection (MPI). Delivering 85 kW (116 PS) at 5,800 rpm and 162 Nm of torque at 3,500 rpm, it was engineered for balanced performance and refinement in compact executive models.
Fitted primarily to the Audi A4 (B5) and Audi A6 (C4), the ALT engine was designed to offer responsiv…
Production years 1997–2000 meet Euro 2 emissions standards; equipped with catalytic converter and EVAP system (VCA UK Type Approval #VCA/EMS/8012).
The Audi ALT is a 1,781 cc inline-four petrol engine engineered for compact sedans and wagons (1997–2002). It utilises a DOHC 16-valve layout with sequential multi-point fuel injection to deliver smooth power delivery and improved efficiency. Designed to meet Euro 2 standards, it balances drivability with emissions compliance through closed-loop lambda control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,781 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 81.0 mm × 86.4 mm | |
Power output | 85 kW (116 PS) @ 5,800 rpm | |
Torque | 162 Nm @ 3,500 rpm | |
Fuel system | Sequential multi-point fuel injection (MPI) | |
Emissions standard | Euro 2 | |
Compression ratio | 10.3:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Timing belt (DOHC, front-mounted) | |
Oil type | SAE 5W-40, ACEA A2/A3 | |
Dry weight | 132 kg |
The Audi ALT was used across Audi's B5 and C4 platforms with longitudinal mounting. This engine received platform-specific adaptations-shorter accessory drives in the A4 and reinforced engine mounts in the A6-and from 1999 the facelifted A4 (B5) models adopted revised intake manifolds, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The ALT's primary reliability risk is timing belt failure due to tensioner wear, with elevated incidence in vehicles exceeding recommended service intervals. Internal Audi quality reports from 2001 noted a significant number of pre-1999 units requiring belt replacement before 120,000 km, while VCA records show increased failure rates in vehicles operated in high-temperature environments. Infrequent oil changes and extended service intervals increase tensioner degradation risk, making adherence to maintenance schedules critical.
Analysis derived from Audi technical bulletins (1997-2002) and UK DVSA failure statistics (2003-2008). 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 ALT engine is mechanically simple and durable when maintained. However, pre-1999 models are prone to timing belt tensioner failure if service intervals are exceeded. Regular oil changes, belt replacement every 90,000 km, and use of correct oil (5W-40) ensure longevity. Well-maintained units often exceed 200,000 km. Post-1999 revisions improved tensioner reliability significantly.
The most common issues are timing belt tensioner wear leading to belt failure, ignition distributor cap carbon tracking, and intake manifold carbon buildup. Oil leaks from the valve cover gasket are frequent in high-mileage engines. These are documented in Audi SIB 075018 and field service reports from the late 1990s.
The ALT engine was used in the Audi A4 (B5: 1997–2001) and Audi A6 (C4: 1997–2000). It was offered in 1.8 petrol trim without turbocharging or variable valve timing. All applications are front-wheel drive with longitudinal engine mounting. No other Volkswagen Group brands used this specific EA113 variant.
No meaningful tuning potential exists for the ALT. It lacks variable valve timing and turbocharging, and uses a distributor-based ignition system not suited for modern remapping. Performance upgrades are limited to air filter and exhaust improvements, yielding minimal gains. The engine's design prioritises reliability over performance, making significant power increases impractical.
Fuel economy is modest by modern standards. In the Audi A4 B5, combined consumption is approximately 8.3 L/100km (34 mpg UK). Highway driving can achieve ~6.9 L/100km (41 mpg UK), while city use may exceed 10.2 L/100km (28 mpg UK). Real-world efficiency depends heavily on driving style and vehicle condition.
Yes. The ALT is an interference engine. If the timing belt fails, the pistons can strike the open valves, causing catastrophic internal damage. This makes strict adherence to the 90,000 km or 6-year replacement interval essential. Any signs of belt wear or tensioner noise require immediate attention.
Audi specifies SAE 5W-40 oil meeting ACEA A2/A3 standards. Mineral, semi-synthetic, or full-synthetic oils are acceptable. Change intervals should not exceed 15,000 km or 1 year. Proper oil selection ensures lubrication of the timing components and reduces sludge buildup in the crankcase ventilation system.
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.