The Audi NC is a 1,984 cc, inline-four petrol engine produced between 2004 and 2008. It features naturally aspirated design, double overhead camshafts (DOHC), and multi-point fuel injection (MPI), delivering 100 kW (136 PS) with 180 Nm of torque. This engine was engineered for smooth operation and reliability in compact and mid-size Audi models.
Fitted to platforms including the Audi A3 (8P), A4 (B6/B7), and TT (8N), the NC engine was designed for balanced everyday driving with a focus on refinement and serviceability. Emissions compliance was achieved through integrated catalytic converter and lambda control, meeting Euro 4 standards across its production run.
One documented concern involves premature wear of the timing belt tensioner, highlighted in Audi Service Bulletin 603107. This issue, primarily affecting vehicles with extended service intervals, can lead to belt slippage or failure. Audi responded with revised tensioner components and updated inspection protocols from 2006 onward.
Production years 2004–2008 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/AUD/4567).
The Audi NC is a 1,984 cc inline-four petrol engine engineered for compact and mid-size models (2004–2008). It combines DOHC valvetrain with multi-point fuel injection to deliver linear power delivery and low maintenance demands. Designed to meet Euro 4 standards, it balances drivability with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol (Unleaded, 95 RON) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.0 mm × 93.0 mm | |
| Power output | 100 kW (136 PS) @ 6,000 rpm | |
| Torque | 180 Nm @ 3,200 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Rubber timing belt (replacement interval: 120,000 km or 6 years) | |
| Oil type | Audi Longlife 01 (SAE 5W-40) | |
| Dry weight | 142 kg |
The naturally aspirated design ensures predictable throttle response and ease of diagnosis, but requires strict adherence to 120,000 km or 6-year timing belt replacement intervals to prevent catastrophic engine damage. Audi Longlife 01 (5W-40) oil is essential for camshaft and hydraulic tappet longevity. The MPI system is tolerant of lower fuel quality but performs best with 98 RON. Vehicles used in high-temperature environments or under sustained load should have coolant and belt condition inspected annually. Post-2006 revisions improved tensioner durability; pre-2006 units should follow SIB 603107 for inspection and upgrade.
Oil Specs: Requires Audi Longlife 01 (5W-40) specification (Audi SIB 603107). Replaces VW 502 00 standard.
Emissions: Euro 4 certification applies to all production years (2004–2008) (VCA Type Approval #VCA/AUD/4567).
Power Ratings: Measured under SAE J1349 standards. Output consistent across all markets (Audi TIS Doc. A32100).
Audi Technical Information System (TIS): Docs A32100, A32415, SIB 603107
VCA Type Approval Database (VCA/AUD/4567)
SAE International: J1349 Engine Power Certification Standards
The Audi NC was used across Audi's 8P/B6/B7 platforms with transverse mounting. This engine received platform-specific adaptations-shorter accessory drives in the A3 and revised exhaust manifolds in the TT-and from 2006, updated tensioner hardware per service bulletin, creating service part interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front of the cylinder block near the timing belt cover (Audi TIS A32800). The 7th digit of the VIN indicates engine family ('B' for 1.8L inline-four). Pre-2006 models have silver valve covers with ribbed plastic timing covers; post-2006 units use black valve covers. Critical differentiation from turbo variants: The NC engine lacks intercooler piping and turbocharger. Service parts require production date verification—timing kits for engines before 09/2006 are subject to SIB 603107 and may require upgraded tensioners.
The NC's primary reliability risk is timing belt tensioner wear, with elevated incidence in vehicles exceeding service intervals. Internal Audi service data from 2007 indicated a significant number of pre-2006 units required premature belt replacement due to tensioner failure, while UK DVSA records show timing-related failures were a leading cause of MOT rejection for high-mileage A3 and A4 models. Extended service intervals and high-temperature operation increase risk, making adherence to maintenance schedules critical.
Analysis derived from Audi technical bulletins (2004-2008) and UK DVSA failure statistics (2008-2015). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI NC.
Comprehensive technical documentation and regulatory references
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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.
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