The Audi CLHA 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, featuring advanced thermal management, dual injection (TFSI + MPI), and a 48 V mild — hybrid system (MHEV). In its standard configuration, it produces 169 kW (230 PS) and 370 Nm of torque, with optimized combustion efficiency and reduced turbo lag due to electrically assisted turbocharging.
Fitted primarily to…
All CLHA variants meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/9112).
The Audi CLHA is a 1,984 cc inline-four turbocharged petrol engine from the EA888 Gen 4 family (2021–2024). It integrates dual injection, electric turbo assistance, and 48 V mild hybrid technology to deliver responsive performance with reduced emissions. Designed for Euro 6d compliance, it balances performance and efficiency in Audi’s mid-size 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 | 169 kW (230 PS) @ 5,000–6,500 rpm | |
Torque | 370 Nm @ 1,600–4,300 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 Audi CLHA 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 A4 and enhanced cooling in the Q5-and from 2023 received updated fuel system components, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CLHA'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 2024 indicated a notable share of pre-2023 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 (2021-2024) and UK DVSA failure statistics (2022-2025). 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 CLHA delivers strong performance and good efficiency, but early models (2021-2022) had reliability concerns, especially high-pressure fuel pump wear. Later revisions (post-2023) improved pump durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (0W-20 VW 504 00) greatly aid longevity.
The biggest issues are high-pressure fuel pump wear (leading to misfires or hard starting), eTurbo control faults, and intake carbon buildup due to PCV system oil vapour. Other complaints include oil leaks from gaskets and occasional misfires. These are well-documented in Audi service bulletins.
This 2.0L petrol was used in the Audi A4 (B9.5), A5 (B9.5), and Q5 (facelift) from 2021 to 2024. It was primarily offered as the 45 TFSI e-tron variant. The engine is part of the EA888 Gen 4 family shared across Volkswagen Group brands but remains specific to Audi's mid-size lineup in this power output.
Yes. The CLHA is highly tunable. ECU remaps routinely gain +50-70 kW safely on stage 1, as the stock internals handle increased torque well. Aftermarket upgrades (intercooler, exhaust, intake) can further boost output. Enthusiasts frequently remap A4 and Q5 models for sharper throttle response. Tuning should be done carefully with supporting modifications to avoid overstressing the fuel system.
Very competitive. In an A4 45 TFSI e-tron (169 kW) from 2023, typical consumption is ~8.5 L/100km (city) and ~6.2 L/100km (highway), or about 38 mpg UK combined. Real-world figures depend on driving style, but expect 35-42 mpg (UK) on mixed roads for a healthy CLHA engine.
Yes. The EA888 series (like most modern Audis) is an interference engine. This means if the timing chain jumps or breaks, pistons can strike open valves, causing catastrophic engine damage. That's why chain maintenance is critical - any warning rattles should be addressed immediately.
Audi specifies a 0W-20 synthetic oil meeting VW 504 00 (petrol) or 507 00 (multi-vehicle) specification. Always use a quality oil designed for turbocharged direct-injection engines and change it at regular intervals (around 15,000 km or as Audi recommends) to ensure proper fuel pump and turbo lubrication.
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)
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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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