The Audi CN is a 1,968 cc, inline-four turbocharged diesel engine produced between 2023 and 2025. It belongs to the Volkswagen Group’s EA288 Evo engine family, featuring modular diesel architecture, dual-loop EGR, and a variable geometry turbocharger (VGT) with electric assist. In its standard configuration, it produces 100 kW (136 PS) and 320 Nm of torque, with optimized combustion efficiency and reduced NOx emissions through Bosch CRS4 high-pressure injection.
Fitted primarily to the Audi A3 (8Y), A4 (B10), and Q3 (facelift) in 30 TDI trim, the CN was engineered for balanced performance and improved real-world efficiency. It supports cylinder deactivation (ACT) under light load and integrates with a 12 V mild-hybrid system (MHEV) to enhance stop-start functionality and reduce urban emissions. Driving characteristics emphasize smooth refinement and strong low-end pull, meeting Euro 6d emissions standards across its production run.
One documented concern is premature high-pressure fuel pump (HPFP) wear in early production units, highlighted in Audi Service Information Bulletin 2023-11-08. This issue stems from inadequate lubrication under extended oil change intervals. In 2024, Audi issued revised HPFP components and updated oil service protocols to improve long-term reliability.
All CN variants meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/9114).
The Audi CN is a 1,968 cc inline-four turbocharged diesel engine from the EA288 Evo family (2023–2025). It integrates dual-loop EGR, VGT, and MHEV technology to deliver responsive performance with reduced emissions. Designed for Euro 6d compliance, it balances economy and refinement in Audi’s compact and mid-size lineup.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,968 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged with variable geometry turbocharger (VGT) | |
| Bore × stroke | 81.0 mm × 95.5 mm | |
| Power output | 100 kW (136 PS) @ 3,250–4,200 rpm | |
| Torque | 320 Nm @ 1,600–2,750 rpm | |
| Fuel system | Bosch CRS4 common-rail (up to 2,500 bar) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled with dual-circuit thermal management | |
| Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
| Timing system | Chain (reinforced; front-mounted with improved tensioner) | |
| Oil type | VW 507 00 / 505 00 (SAE 0W-30) | |
| Dry weight | 147 kg |
The VGT and CRS4 injection provide strong low-RPM response ideal for urban driving but require strict adherence to 15,000 km oil change intervals to prevent high-pressure fuel pump wear and turbo bearing degradation. VW 507 00 (0W-30) oil is critical due to its low viscosity and protection of the HPFP and turbocharger. Extended idling and cold starts increase stress on the fuel system. The CRS4 pump demands ultra-low-sulfur diesel (ULSD) meeting EN 590 standards to prevent injector coking. Post-2024 models feature revised fuel pumps; pre-2024 units should follow Audi SIB 2023-11-08 for inspection. EGR and DPF systems require periodic cleaning to maintain emissions compliance and prevent limp-mode events.
Oil Specs: Requires VW 507 00 / 505 00 (0W-30) specification (Audi SIB 2024-07-19). Supersedes ACEA C5.
Emissions: All CN models are certified to Euro 6d standards (VCA Type Approval #VCA/EMS/9114).
Power Ratings: Measured under SAE J1349 standards. 100 kW output requires EU5+ diesel (Audi TIS Doc. A28804).
Audi Technical Information System (TIS): Docs A28804, A28805, SIB 2023-11-08
VCA Type Approval Database (VCA/EMS/9114)
SAE International: J1349 Engine Power Certification Standards
The Audi CN was used across Audi's 8Y/B10 platforms with transverse mounting and shared architecture with Volkswagen Group siblings. This engine received platform-specific adaptations-revised intake tracts in the A3 and enhanced cooling in the Q3-and from 2024 received updated fuel system components, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side cylinder block near the exhaust manifold (Audi TIS A28804). The 8th VIN digit indicates engine family ('D' for EA288 series). Pre-2024 models have silver valve covers with black plastic timing covers; post-2024 units use black valve covers. Critical differentiation from CJEB: CN includes MHEV integration and revised EGR routing. Service parts require production date verification - fuel pumps for engines before 11/2023 are incompatible with later units due to internal redesign (Audi SIB 2023-11-08).
The CN's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in mixed urban/highway use. Internal Audi quality reports from 2025 indicated a notable share of pre-2024 engines requiring HPFP replacement before 100,000 km, while UK DVSA records link a significant portion of emissions-related MOT failures to EGR clogging in city-driven vehicles. Cold-start cycles and extended idling increase fuel system stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2023-2025) and UK DVSA failure statistics (2024-2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CN.
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