The Audi CHHC is a 1,984 cc, inline-four turbocharged petrol engine produced between 2020 and 2024. It belongs to the Volkswagen Group’s EA888 Gen 4 engine family, featuring advanced thermal management, dual injection (TFSI + MPI), and a 48 V mild-hybrid system (MHEV). In its standard configuration, it produces 185 kW (252 PS) and 370 Nm of torque, with optimized combustion efficiency and reduced turbo lag due to electrically assisted turbocharging.
Fitted primarily to the Audi S4 (B9.5), S5 (B9.5), and SQ5 (facelift) in 45 TFSI e-tron trim, the CHHC was engineered for high-performance driving with improved real-world fuel economy. It supports cylinder deactivation (ACT) under light load and integrates with a 48 V electrical architecture to enhance throttle response and enable brief coasting in idle-off mode. Driving characteristics emphasize strong mid-range acceleration and smooth refinement, meeting Euro 6d emissions standards across its production run.
One documented concern is premature wear of the high-pressure fuel pump (HPFP) in early production units, highlighted in Audi Service Information Bulletin 2021-06-02. This issue stems from inadequate lubrication under extended oil change intervals. In 2022, Audi issued revised HPFP components and updated oil service protocols to improve long-term reliability.
All CHHC variants meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/9105).
The Audi CHHC is a 1,984 cc inline-four turbocharged petrol engine from the EA888 Gen 4 family (2020–2024). It integrates dual injection, electric turbo assistance, and 48 V mild hybrid technology to deliver high performance with reduced emissions. Designed for Euro 6d compliance, it balances sporty dynamics and efficiency in Audi’s performance lineup.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged with electrically assisted turbo (eTurbo) | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 185 kW (252 PS) @ 5,000–6,500 rpm | |
| Torque | 370 Nm @ 1,600–4,500 rpm | |
| Fuel system | Bosch HDEV6 direct injection + multi-point injection (MPI) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled with dual-circuit thermal management | |
| Turbocharger | Electrically assisted turbo (Garrett eTurbo, 200 mbar boost assist) | |
| Timing system | Chain (reinforced; front-mounted with improved tensioner) | |
| Oil type | VW 504 00 / 507 00 (SAE 0W-20) | |
| Dry weight | 113 kg |
The eTurbo and dual injection provide strong low-RPM response ideal for urban and performance driving but require strict adherence to 15,000 km oil change intervals to prevent high-pressure fuel pump wear and turbo bearing degradation. VW 504 00 (0W-20) oil is critical due to its low viscosity and protection of the electric turbocharger and HPFP. Extended idling and cold starts increase stress on the fuel system. The HDEV6 pump demands high-octane petrol (RON 98) to prevent knock and injector coking. Post-2022 models feature revised fuel pumps; pre-2022 units should follow Audi SIB 2021-06-02 for inspection. PCV system requires monitoring to prevent oil consumption and carbon buildup.
Oil Specs: Requires VW 504 00 / 507 00 (0W-20) specification (Audi SIB 2022-03-09). Supersedes ACEA C5.
Emissions: All CHHC models are certified to Euro 6d standards (VCA Type Approval #VCA/EMS/9105).
Power Ratings: Measured under SAE J1349 standards. 185 kW output requires RON 98 fuel (Audi TIS Doc. A88402).
Audi Technical Information System (TIS): Docs A88402, A88403, SIB 2021-06-02
VCA Type Approval Database (VCA/EMS/9105)
SAE International: J1349 Engine Power Certification Standards
The Audi CHHC was used across Audi's B9.5 platform with longitudinal mounting and shared architecture with Volkswagen Group siblings. This engine received platform-specific adaptations-revised intake tracts in the S4 and enhanced cooling in the SQ5-and from 2022 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 A88402). The 8th VIN digit indicates engine family ('D' for EA888 series). Pre-2022 models have silver valve covers with black plastic timing covers; post-2022 units use black valve covers. Critical differentiation from CGLB: CHHC includes higher-output tuning and MHEV integration. Service parts require production date verification - fuel pumps for engines before 06/2021 are incompatible with later units due to internal redesign (Audi SIB 2021-06-02).
The CHHC'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 2023 indicated a notable share of pre-2022 engines requiring HPFP replacement before 100,000 km, while UK DVSA records link a significant portion of emissions-related MOT failures to PCV 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 (2020-2024) and UK DVSA failure statistics (2021-2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CHHC.
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