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 CMHA engine was engineered for dynamic driving characteristics and compliance with Euro 6d emissions standards. It utilises a gasoline particulate filter (GPF), three-way catalytic converter, and exhaust gas recirculation (EGR) to meet stringent EU Regulation (EC) No 715/2007 requirements. Its integrated exhaust manifold within the cylinder head improves warm-up times and reduces turbo lag.
One documented enhancement is the updated timing chain tensioner introduced in 2020 per Audi Service Information Bulletin 2020-05. This revision addressed early wear concerns in the chain drive system by reinforcing the hydraulic tensioner and guide rails. The CMHA also features a map-controlled thermostat and electric coolant pump for precise thermal regulation and reduced friction losses.
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 CMHA's dual injection system provides strong low-RPM response and reduced intake carbon buildup compared to direct-only systems, but demands adherence to 15,000 km oil change intervals using VW 502 00/505 00 oil to protect the turbocharger and timing chain. The Bosch HDEV6 system requires premium-grade petrol (RON 98 recommended, 95 minimum) to optimise performance and prevent knock. The timing chain is designed for the life of the engine under normal conditions; however, oil neglect can lead to tensioner wear. GPF-equipped models require regular highway runs to maintain filter regeneration and prevent clogging. Post-2020 models benefit from revised tensioner design per Audi SIB 2020-05, improving long-term reliability.
Oil Specs: Requires VW 502 00 / 505 00 specification (Audi SIB 2020-05). Compatible with ACEA A1/B1.
Emissions: Euro 6c applies to 2019–2020 models; Euro 6d certification confirmed for 2021–2023 units (VCA Type Approval #VCA/EMS/9234).
Power Ratings: Measured under SAE J1349 standards. Output consistent across EU markets with RON 95 fuel (Audi TIS Doc. A43200).
Audi Technical Information System (TIS): Docs A43200, A43275, SIB 2020-05
VCA Type Approval Database (VCA/EMS/9234)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on the right-side engine block near the exhaust manifold (Audi TIS A43200). The 8th VIN digit indicates engine type ('C' for EA888 series). Pre-2021 models lack a gasoline particulate filter (GPF); post-2021 units feature a GPF in the exhaust downpipe with a grey catalytic converter housing. Critical differentiation from EA888 variants: CMHA has dual injection (HDEV6), ECU mapping (06F906027BH), and KP39 turbo (BorgWarner). Service parts require production date verification—intake manifolds and fuel injectors are not interchangeable between pre- and post-2020 revisions due to tensioner and ECU updates (Audi SIB 2020-05).
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.
Find answers to most commonly asked questions about AUDI CMHA.
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