The Audi NG is a 1,781 cc, inline-four petrol engine produced between 2000 and 2008. It features multi-point fuel injection (MPI), double overhead camshafts (DOHC), and variable valve timing (VVT), delivering 85 kW (115 PS) and 170 Nm of torque. Designed for compact and mid-size applications, it balances fuel efficiency with smooth urban drivability.
Fitted to models including the Audi A3 (8L), A4 (B5, B6), and TT (8N), the NG engine was engineered for economical daily driving and light highway use. It meets Euro 3 and Euro 4 emissions standards through a three-way catalytic converter and closed-loop lambda control, with no direct injection or turbocharging to ensure long-term serviceability.
One documented concern is premature wear of the timing belt tensioner, highlighted in Audi Service Information Bulletin 01 10 45. This issue stems from inadequate lubrication in early production units and can lead to belt slippage or failure. From 2004 onward, Audi introduced revised tensioner components and updated inspection intervals to improve durability.
Production years 2000–2003 meet Euro 3 standards; 2004–2008 models comply with Euro 4 (VCA UK Type Approval #VCA/AUD/4003).
The Audi NG is a 1,781 cc inline-four naturally aspirated petrol engine engineered for compact and mid-size platforms (2000–2008). It combines multi-point injection with variable valve timing to deliver linear power delivery and responsive low-end torque. Designed to meet Euro 3 and Euro 4 standards, it prioritizes reliability and ease of maintenance over high specific output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,781 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 86.4 mm | |
| Power output | 85 kW (115 PS) @ 5,700 rpm | |
| Torque | 170 Nm @ 3,500 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 3 / Euro 4 | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Rubber timing belt (interval: 120,000 km or 5 years) | |
| Oil type | VW 502 00 / 505 00 (SAE 5W-30) | |
| Dry weight | 112 kg |
The naturally aspirated design offers predictable throttle response but limited high-RPM power, requiring downshifting for overtaking. Strict adherence to 120,000 km or 5-year timing belt replacement is essential to prevent valve damage. Use of VW 502 00-specified oil ensures compatibility with variable valve timing components. The MPI system is less prone to carbon buildup than direct injection but benefits from periodic intake cleaning. Post-2004 models feature updated tensioner assemblies per Audi SIB 01 10 45, reducing risk of premature belt failure.
Oil Specs: Requires VW 502 00 or 505 00 specification (Audi SIB 01 10 45). Compatible with ACEA A1/B1 standards.
Emissions: Euro 3 certification applies to 2000–2003 models; Euro 4 applies to 2004–2008 (VCA Type Approval #VCA/AUD/4003).
Power Ratings: Measured under ECE R85 standards. Output consistent across all markets (Audi Group PT-2015).
Audi Technical Information System (TIS): Docs A28100, A28410, SIB 01 10 45
VCA Type Approval Database (VCA/AUD/4003)
European Commission Regulation (EC) No 715/2007
The Audi NG was used across Audi's 8L/B5/B6 platforms with transverse mounting and shared with SEAT and Volkswagen under the EA113 engine family. This engine received platform-specific tuning—slightly revised intake manifolds in the A4 and exhaust routing in the TT—and from 2004 the facelifted A3 adopted updated emissions calibration, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right side of the cylinder block, near the exhaust manifold (Audi TIS A28105). The 8th VIN digit indicates engine type ('D' for NG series). Pre-2004 units have silver valve covers with black coil packs; post-2004 models use black valve covers. Critical differentiation from 1.8 T: The NG MPI engine lacks a turbocharger and intercooler. Service parts require production date verification—timing belt kits for pre-2004 models are incompatible with revised tensioner design (Audi SIB 01 10 45).
The NG engine's primary reliability risk is timing belt failure on neglected units, with elevated incidence in high-temperature climates. Internal Audi quality reports from 2005 noted a significant share of pre-2004 engines suffering belt-related damage beyond 120,000 km, while VCA MOT data links valve train noise to delayed replacements. Extended service intervals and poor tensioner condition increase risk, making adherence to 5-year replacement critical.
Analysis derived from Audi technical bulletins (2000–2008) and UK DVSA failure statistics (2010–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI NG.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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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.
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