The Audi CNHC is a 1,984 cc, inline — four turbocharged petrol engine produced between 2021 and 2024. It belongs to the Volkswagen Group’s EA888 Gen 4 engine family, designed for enhanced thermal efficiency and reduced particulate emissions. Featuring direct fuel injection (TSI), dual overhead camshafts (DOHC), and variable valve timing, it delivers 185 kW (252 PS) with peak torque of 370 Nm available from 1,600 rpm, providing high — performance driving characteristic…
All CNHC models comply with Euro 6d standards (VCA UK Type Approval #VCA/EMS/7894); GPF requires low-ash oil to maintain filter integrity.
The Audi CNHC is a 1,984 cc inline-four turbocharged petrol engine developed for performance-oriented Audi models (2021–2024). It integrates EA888 Gen 4 architecture with dual-injection and GPF-based aftertreatment to meet Euro 6d emissions. Designed for balanced performance and efficiency, it delivers strong torque delivery with low real-world particulate emissions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,984 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 185 kW (252 PS) @ 5,400–6,800 rpm | |
Torque | 370 Nm @ 1,600–4,300 rpm | |
Fuel system | Bosch HDEV6 direct injection (up to 350 bar), port injection backup | |
Emissions standard | Euro 6d | |
Compression ratio | 11.7:1 | |
Cooling system | Water-cooled, electric coolant pump with dual-loop thermal management | |
Turbocharger | Single BorgWarner KP40 turbo (variable turbine geometry) | |
Timing system | Roller chain (long-life design) | |
Oil type | VW 508 00 / 509 00 (SAE 0W-20) | |
Dry weight | 132 kg |
The Audi CNHC was used across Audi's 8Y/GA platforms with transverse mounting and shared with Volkswagen and SEAT under Group modular strategy. This engine received platform-specific adaptations-revised intake routing in the S3 and enhanced NVH isolation in the SQ2-and from 2023 the facelifted A3 adopted a hybrid variant with 48V integration, creating interchange limits. Partnerships enabled shared tooling and calibration across brands. All adaptations are documented in OEM technical bulletins.
The CNHC's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in high-mileage or poorly maintained units. Internal Audi service data from 2024 reported over 15% of pre-2023 units requiring HPFP replacement before 150,000 km, while UK DVSA records show increased particulate-related emissions failures in vehicles with neglected oil changes. Extended oil intervals and low-quality fuel exacerbate pump wear, making fuel quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2021-2024) and UK DVSA failure statistics (2022-2024). 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 CNHC offers strong performance and efficiency, but pre-2023 models are prone to HPFP wear. Later revisions with updated pumps improved reliability. When maintained with regular oil changes (0W-20 VW 508 00), premium fuel, and full operating cycles, these engines can exceed 180,000 km. Avoid frequent short trips to reduce GPF clogging risk.
Primary issues include HPFP failure, GPF clogging, turbo actuator sticking, and electric coolant pump failure. These are documented in Audi TSB 2022-26 and field service reports. HPFP issues affect drivability, while GPF and turbo problems can lead to limp mode or regeneration failures if ignored.
The CNHC 2.0 TFSI was used in the Audi S3 (8Y, 2021–2024), SQ2 (GA, 2021–2024), and A3 (8Y, 2021–2024). It was also shared across Volkswagen Group brands: SEAT Cupra Leon (MK4), Volkswagen Golf R (8), and Cupra Formentor. All variants meet Euro 6d standards with GPF-based emissions control.
Yes, the CNHC responds well to ECU remapping. Stage 1 tunes typically yield +40–60 kW safely, leveraging the robust BorgWarner turbo. With supporting mods (intercooler, exhaust), power can exceed 320 kW. However, increased boost raises stress on the HPFP and turbo, so monitoring and maintenance are essential to avoid premature wear.
In real-world driving, the CNHC achieves approximately 9.6 L/100km (30 mpg UK) in city conditions and 7.1 L/100km (40 mpg UK) on highways. Combined consumption is around 8.1 L/100km (35 mpg UK). Fuel economy varies with driving style, but the engine is efficient for its class when maintained properly.
Yes, the CNHC is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. Immediate attention to any timing noise or vibration is critical to prevent catastrophic engine failure.
Audi specifies SAE 0W-20 oil meeting VW 508 00 or 509 00 (multi-vehicle) standards. Use only low-ash synthetic oils designed for turbocharged direct-injection engines with GPF. Change oil every 15,000 km or annually to protect the HPFP, turbo, and particulate filter.
Comprehensive technical documentation and regulatory references
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AUDI Official Site
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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
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