The Audi CMHA is a 1,984 cc, inline — four turbocharged petrol engine produced between 2019 and 2023. Part of the Volkswagen Group's EA888 Gen 4 engine family, it features advanced thermal management, dual fuel injection (TFSI), and a revised timing chain system. Delivering 140 kW (190 PS) and 320 Nm of torque, it balances responsive performance with improved emissions control and long — term reliability.
Fitted to models including the Audi A4 (B9), A5 (F5), and Q5 (FY), the…
Production years 2019–2020 meet Euro 6c standards; 2021–2023 models comply with Euro 6d (VCA UK Type Approval #VCA/EMS/9234).
The Audi CMHA is a 1,984 cc inline-four turbocharged petrol engine designed for transverse and longitudinal applications (2019–2023). It combines dual injection (port + direct) with a compact turbocharger and integrated exhaust manifold to deliver strong mid-range torque. Engineered to meet Euro 6d standards, it prioritises emissions control and thermal efficiency without sacrificing performance.
| 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 | 140 kW (190 PS) @ 3,900–6,000 rpm | |
Torque | 320 Nm @ 1,500–3,900 rpm | |
Fuel system | Bosch HDEV6 dual injection (200 bar direct, 6 bar port) | |
Emissions standard | Euro 6c (2019–2020); Euro 6d (2021–2023) | |
Compression ratio | 9.6:1 | |
Cooling system | Water-cooled with map-controlled thermostat and electric pump | |
Turbocharger | Single-scroll turbo (BorgWarner KP39) | |
Timing system | Timing chain (lifetime service interval) | |
Oil type | VW 502 00 / 505 00 (SAE 5W-30) | |
Dry weight | 135 kg |
The Audi CMHA was used across Audi's B9/F5/FY platforms with transverse and longitudinal mounting and shared within the Volkswagen Group for performance applications. This engine received platform-specific calibrations-shorter intake runners in the A4 and revised cooling routing in the Q5-and from 2021 updated GPF integration for Euro 6d compliance, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CMHA's primary reliability risk is intake valve carbon buildup in vehicles used for short-trip driving. Internal Audi quality reports from 2022 noted increased GPF regeneration frequency in urban-driven units before 100,000 km, while UK DVSA MOT data shows catalyst efficiency as a leading cause of emissions failures. Cold climates and low-quality fuel amplify system stress, making regular highway runs and use of premium petrol critical.
Analysis derived from Audi technical bulletins (2019–2023) and UK DVSA failure statistics (2023–2024). 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 CMHA offers strong performance and good efficiency, with robust internal components. The timing chain is designed for the life of the engine when maintained properly. Regular use of premium petrol (RON 98), adherence to oil change intervals with VW 502 00/505 00 oil, and periodic highway runs to regenerate the GPF are essential for long-term reliability, especially in urban-driven vehicles.
Key issues include intake valve carbon buildup, GPF clogging, timing chain tensioner wear, and oil leaks from the valve cover gasket. These are documented in Audi service bulletins, particularly SIB 2020-05 for tensioner improvements. Urban driving and low-quality fuel exacerbate carbon and emissions system issues.
The CMHA engine was used in the Audi A4 (B9, 2019–2023), A5 (F5, 2019–2023), Q5 (FY, 2019–2023), and A6 (C8, 2020–2023). It was phased out in favour of updated EA888 evo4 variants with improved efficiency and emissions post-2023.
Yes, the CMHA responds exceptionally well to ECU remapping. Stage 1 tunes typically achieve 230–250 PS safely. The robust internals of the EA888 Gen 4 handle increased boost and torque well. However, supporting modifications like improved cooling and high-quality fuel are strongly advised to maintain reliability under higher loads.
In mixed driving, the CMHA achieves approximately 7.0–7.8 L/100km (36–40 mpg UK). Highway efficiency is around 6.0 L/100km (47 mpg UK), while city driving may reach 9.0 L/100km (31 mpg UK). Real-world figures depend on driving style, vehicle weight, and condition of emissions systems.
Yes, the CMHA is an interference engine. If the timing chain fails, pistons will contact open valves, resulting in severe internal damage. Although the chain is designed for the life of the engine, maintaining correct oil type and service intervals is critical to avoid costly repairs.
Audi specifies VW 502 00 / 505 00 (SAE 5W-30) synthetic oil. This formulation is essential for turbocharger, timing chain, and GPF longevity. Oil changes should be performed every 15,000 km or annually to maintain engine health and prevent sludge buildup and oil consumption.
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Regulation (EC) No 715/2007
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