The Audi SD is a 1,984 cc, inline-four, naturally aspirated petrol engine produced between 2013 and 2020. It was developed as part of the Volkswagen Group's modular transverse matrix (MQB) strategy to deliver refined efficiency and smooth operation in mid-tier models. Featuring double overhead camshafts (DOHC), multi-point fuel injection (MPI), and variable valve timing (VVT), it produced 81 kW (110 PS) and 180 Nm of torque, offering balanced performance for daily driving.
Fitted primarily to the Audi A3 (8V) and Škoda Octavia Mk3, the SD engine was engineered for durability and ease of ownership. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, meeting Euro 5 standards across its initial production run, with later units conforming to Euro 6c specifications depending on market and model year.
One documented reliability concern involves premature wear of the timing belt tensioner, particularly in early production units. This issue, referenced in Audi Service Information Bulletin 01 14 26, is attributed to suboptimal damping characteristics under prolonged thermal cycling. From 2016, Audi introduced an updated tensioner assembly to improve long-term durability.
Production years 2013–2015 meet Euro 5 standards; 2016–2020 models comply with Euro 6c depending on market (VCA UK Type Approval #VCA/EMS/5680).
The Audi SD is a 1,984 cc inline-four naturally aspirated petrol engine engineered for compact and mid-size hatchbacks (2013–2020). It combines MPI fuel delivery with variable valve timing to deliver smooth, linear performance. Designed to meet Euro 5 and Euro 6c emissions standards, it prioritizes longevity and serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 81 kW (110 PS) @ 5,800 rpm | |
| Torque | 180 Nm @ 3,200 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 5 (pre-2016); Euro 6c (2016–2020) | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Rubber timing belt (interval: 150,000 km or 5 years) | |
| Oil type | VW 502 00 / 505 00 (SAE 5W-30) | |
| Dry weight | 103 kg |
The naturally aspirated design provides smooth throttle response ideal for relaxed driving but requires strict adherence to 150,000 km or 5-year timing belt service intervals to prevent catastrophic engine damage. VW 502 00 (5W-30) oil is essential for camshaft and valvetrain longevity. Use of fuel with minimum 95 RON is required to prevent knock under load. The MPI system is robust but sensitive to carbon buildup on intake valves over time, especially with short-trip driving. Post-2016 models feature revised tensioner design; pre-2016 units should be inspected per Audi SIB 01 14 26. Catalytic converter longevity depends on consistent warm-up cycles and use of unleaded petrol meeting EN 228 standards.
Oil Specs: Requires VW 502 00 / 505 00 specification (Audi SIB 01 14 26). Compatible with ACEA A1/B1 and A5/B5 standards.
Emissions: Euro 5 certification applies to pre-2016 models only (VCA Type Approval #VCA/EMS/5680). Euro 6c compliance confirmed for 2016–2020 models in applicable markets.
Power Ratings: Measured under ECE R85 standards. Output consistent across fuel grades meeting minimum 95 RON (Audi TIS Doc. A32012).
Audi Technical Information System (TIS): Docs A31024, A31546, SIB 01 14 26
VCA Type Approval Database (VCA/EMS/5680)
European Commission Regulation (EC) No 715/2007
The Audi SD was used across Audi's 8V platform with transverse mounting and shared within the Volkswagen Group for use in SEAT and Škoda applications. This engine received platform-specific adaptations-longer intake runners in the A3 and revised ECU mappings for DSG variants-and from 2016 the facelifted A3 (8V) models adopted updated tensioner hardware, creating service part interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the transmission bellhousing (Audi TIS A31202). The 8th VIN digit indicates engine type ('D' for 1.8L MPI in A3). Pre-2016 models have a silver timing cover with ribbed texture; post-2016 units use a smooth black cover. Critical differentiation from 1.8 TFSI: SD engine lacks turbocharger and intercooler, with MPI injectors located in the intake manifold. Service parts require production date verification—timing belt kits for pre-2016 models are incompatible with post-update assemblies due to tensioner redesign (Audi SIB 01 14 26).
The SD's primary reliability risk is timing belt tensioner wear on early builds, with elevated incidence in mixed urban/highway use. Internal Audi quality reports from 2015 noted a subset of pre-2016 engines requiring premature belt replacement before 120,000 km, while VCA records show timing-related failures contributing to MOT advisories. Extended service intervals and short-trip driving increase tensioner and belt stress, making adherence to maintenance schedules critical.
Analysis derived from Audi technical bulletins (2013-2018) and UK DVSA failure statistics (2016-2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI SD.
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.
