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 ; 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 | Refer to vehicle handbook / manufacturer specification | |
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.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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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.
Aftermarket ECU tuning is common on the CNHC platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
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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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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.
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