The Audi CMGB is a 1,984 cc, inline — four turbocharged petrol engine produced between 2019 and 2024. It belongs to the Volkswagen Group's EA888 Gen 4 engine family, designed for enhanced thermal efficiency, reduced particulate emissions, and improved responsiveness over prior generations. Featuring direct fuel injection (TSI), variable valve timing, and dual overhead camshafts (DOHC), it delivers 140 kW (190 PS) and 320 Nm of torque, with 48V mild — hybrid (MHEV) inte…
All production years (2019–2024) comply with Euro 6d-TEMP and Euro 6e standards (VCA UK Type Approval #VCA/EMS/9012).
The Audi CMGB is a 1,984 cc inline-four turbocharged petrol engine engineered for mid-size and compact SUV platforms (2019–2024). It combines central direct injection with a single turbocharger and 48V mild-hybrid system to deliver responsive mid-range performance and improved efficiency. Designed to meet Euro 6d-TEMP and Euro 6e standards, it balances real-world emissions compliance with driving dynamics.
| 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) @ 4,200–6,000 rpm | |
Torque | 320 Nm @ 1,500–4,200 rpm | |
Fuel system | Bosch HDEV6 high-pressure direct injection (up to 350 bar) | |
Emissions standard | Euro 6d-TEMP (2019–2022); Euro 6e (2022–2024) | |
Compression ratio | 9.8:1 | |
Cooling system | Water-cooled with thermal management module | |
Turbocharger | Single turbo (IHI VF45 variable-vane) | |
Timing system | Roller chain (non-interference design) | |
Oil type | VW 502 00 / 505 00 (SAE 5W-30) | |
Dry weight | 141 kg |
The Audi CMGB was used across Audi's B9/F5/FY platforms with longitudinal mounting in quattro variants and transverse in front-wheel-drive models. This engine features 48V mild-hybrid integration from 2019 onward and GPF systems standard on all units, ensuring Euro 6d-TEMP and Euro 6e compliance. Platform-specific calibrations and hybrid integration create interchange limits. All adaptations are documented in OEM technical bulletins.
The CMGB's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in vehicles with extended service intervals. Internal Audi field reports from 2023 indicated a significant number of pre-2021 units required HPFP replacement before 170,000 km, while UK DVSA MOT data shows GPF-related failures are common in short-trip petrol vehicles. Prolonged high-load operation and incorrect oil can accelerate pump wear, making correct lubricant selection and service adherence critical.
Analysis derived from Audi technical bulletins (2020-2023) and UK DVSA failure statistics (2021-2024). Repair procedures should follow manufacturer guidelines.
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The CMGB is generally robust, especially compared to earlier EA888 engines. The main concern is HPFP wear in vehicles with extended oil intervals. When maintained with correct oil (VW 502 00/505 00) and regular service, the engine is reliable beyond 200,000 km. Timing chains are durable, but tensioners may wear beyond 200,000 km. The 48V MHEV system adds complexity but is generally reliable when maintained. Using correct oil and driving regularly on highways greatly enhances longevity.
Primary issues include high-pressure fuel pump wear, GPF clogging, and turbocharger wastegate actuator sticking. Secondary concerns are timing chain tensioner rattle and occasional carbon buildup on intake valves. These are documented in Audi service bulletins, particularly SIB 2020-04-01 for HPFP improvements and SIB 2019-04-01 for oil specification enforcement.
The CMGB 2.0 TFSI 190 PS was used in the Audi A4 (B9, 2019–2024), A5 (F5, 2019–2024), Q5 (FY, 2019–2024), A6 (C8, 2020–2024), and Q7 (4M, 2021–2024). It was available in both front-wheel-drive and quattro configurations. All models feature GPF systems and 48V mild-hybrid integration from 2019 onward, meeting Euro 6d-TEMP and Euro 6e emissions standards.
Yes, the CMGB responds well to ECU remapping. Stage 1 tunes typically achieve 230–245 PS safely, as the stock turbo and internals handle increased boost. Further gains require upgraded turbo, intercooler, and fueling. Tuning can increase GPF and turbo stress, so enhanced cooling and regular servicing are recommended to maintain reliability. The 48V system can support additional torque-fill in custom maps.
Good. In an A4 2.0 TFSI (190 PS), combined consumption is ~6.4 L/100km (44 mpg UK). Highway runs can achieve ~5.7 L/100km (49 mpg UK), while city driving may reach ~8.0 L/100km (35 mpg UK). Real-world figures for mixed driving typically range from 35–45 mpg UK, depending on driving style and condition. The 48V MHEV system contributes to efficiency via coasting and regenerative braking.
No. The CMGB uses a non-interference valvetrain design. If the timing chain fails, piston-to-valve contact is unlikely, reducing the risk of catastrophic engine damage. However, any timing issue still requires immediate repair to prevent valve or piston damage from secondary contact or loss of compression.
Audi specifies VW 502 00 / 505 00 (SAE 5W-30) synthetic oil. This low-ash formulation is essential for protecting the turbocharger, high-pressure fuel pump, and GPF. Change intervals are 15,000 km or annually under normal conditions, but shorten to 10,000 km for frequent short trips or towing.
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