The Audi CHMA is a 1,984 cc, inline-four turbocharged petrol engine produced between 2019 and 2023. It belongs to the Volkswagen Group's EA888 Gen 4 engine family, featuring aluminium construction, direct fuel injection (TSI), and dual overhead camshafts. Delivering 140 kW (190 PS) and 320 Nm of torque, it integrates a 48V mild-hybrid system (MHEV) to enhance efficiency and drivability.
Fitted to models such as the Audi A4 (B9), A5 (F5), and A6 (C8), the CHMA engine was engineered for refined daily performance and improved fuel economy. Its emissions compliance is achieved through a three-way catalytic converter, gasoline particulate filter (GPF), and lean NOx trap technology, meeting Euro 6d-TEMP standards across its production run with no earlier emissions variants.
One documented concern is high-pressure fuel injector coking under short-trip driving conditions, highlighted in Volkswagen Group Technical Service Bulletin 2020-05-03. The issue stems from carbon buildup on injector tips due to frequent cold starts and low exhaust temperatures. From 2021, revised injector coatings and updated ECU fuel strategies were implemented to reduce deposit formation.
Production years 2019–2023 meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/9407).
The Audi CHMA is a 1,984 cc inline-four turbocharged petrol engine engineered for premium Audi models (2019–2023). It combines TSI direct injection with twin-scroll turbocharging, a 48V mild-hybrid system (MHEV), and a gasoline particulate filter (GPF) to deliver responsive performance and emissions compliance. Designed for Euro 6d-TEMP, it supports both urban and highway driving profiles.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 140 kW (190 PS) @ 4,200–6,000 rpm | |
| Torque | 320 Nm @ 1,500–4,000 rpm | |
| Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single twin-scroll turbo (Honeywell GT1749V) | |
| Timing system | Chain (front-mounted; revised guide design post-2021) | |
| Oil type | VW 504 00 / 507 00 (SAE 0W-20) | |
| Dry weight | 112 kg |
The twin-scroll turbo and 48V MHEV system provide strong low-RPM torque and coasting capability, but require strict adherence to 15,000 km or annual oil changes to prevent injector coking and turbo degradation. VW 504 00 (0W-20) oil is critical due to its low-viscosity formulation supporting the MHEV belt-driven starter-generator and chain lubrication. The HDEV6 fuel system demands high-octane petrol (RON 98 recommended) to prevent knock and injector coking. Post-2021 models feature upgraded injector coatings; pre-2021 units should follow VW TSB 2020-05-03 for inspection intervals. GPF longevity depends on regular highway runs to enable passive regeneration and prevent soot saturation.
Oil Specs: Requires VW 504 00 / 507 00 (0W-20) specification (Audi SIB 2021-06-08). Supersedes ACEA C5.
Emissions: Euro 6d-TEMP certification applies to all CHMA models (VCA Type Approval #VCA/EMS/9407). No Euro 6b or earlier variant exists.
Power Ratings: Measured under SAE J1349 standards. Output requires RON 98 fuel for full performance and MHEV functionality (Audi TIS Doc. A13801).
Audi Technical Information System (TIS): Docs A13501, A13644, A13722, SIB 2021-06-08
VCA Type Approval Database (VCA/EMS/9407)
SAE International: J1349 Engine Power Certification Standards
The Audi CHMA was used across Audi's B9/F5/C8 platforms with longitudinal mounting. This engine received platform-specific adaptations-revised cooling routing in the A6 and integrated MHEV control in the A5-and from 2021 the facelifted A4 adopted the CZRB variant with revised valve timing, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right-side cylinder block near the exhaust manifold (Audi TIS A13522). The 8th VIN digit indicates engine family ('C' for EA888 2.0 TFSI). Pre-2021 models have silver valve covers with black plastic cam covers; post-2021 units use black valve covers. Critical differentiation from CZRB: Original CHMA has Bosch MED 17.1.1 ECU with 80-pin connector, while CZRB uses MED 17.8.8 with 100-pin. Service parts require production date verification - fuel injectors and GPF assemblies for engines before 03/2021 are incompatible with later units due to internal redesign (VW TSB 2020-05-03).
The CHMA's primary reliability risk is fuel injector coking on early builds, with elevated incidence in urban short-trip use. Internal Volkswagen quality reports from 2021 indicated a significant number of pre-2021 engines requiring injector cleaning or replacement before 80,000 km, while UK DVSA records link a notable portion of emissions-related MOT failures to GPF saturation in frequently cold-driven vehicles. Frequent cold starts and extended oil intervals increase injector and turbo stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2019–2023) and UK DVSA failure statistics (2020–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CHMA.
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