The Audi CMUA is a 1,984 cc, inline-four turbocharged petrol engine produced between 2019 and 2023. It belongs to the Volkswagen Group's EA888 engine family (Gen 4), featuring direct fuel injection (TSI), variable valve timing (VVT), and dual overhead camshafts (DOHC). In standard tune, it produces 140 kW (190 PS) and 320 Nm of torque, delivering responsive performance and strong mid-range driveability.
Fitted to models including the 8W A5, 8XC A6, and 8X A7, the CMUA was engineered for drivers seeking a blend of sporty dynamics and refined daily usability. It incorporates both port and direct fuel injection to reduce intake valve coking, while an integrated thermal management system enables rapid warm-up and improved efficiency. Emissions compliance is achieved through a close-coupled three-way catalyst and lambda control, meeting Euro 6d standards across all production years.
One documented service concern is premature wear of the high-pressure fuel pump (HPFP) drive cam, noted in Audi Technical Service Bulletin 2019-22-01. This wear stems from inadequate lubrication at the cam follower interface under extended oil change intervals. Later production engines received an updated HPFP assembly and revised oil maintenance schedules to mitigate the risk.
Production years 2019–2023 meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/6794).
The Audi CMUA is a 1,984 cc inline-four turbo-petrol engine developed for longitudinal-platform applications (2019–2023). It combines turbocharging with dual injection (direct + port) to deliver smooth power delivery and strong mid-range torque. Designed to meet Euro 6d emissions standards, it balances performance with improved fuel efficiency and reduced particulate emissions.
| 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 @ 1,450–4,200 rpm | |
| Fuel system | TSI: Direct + port injection (Bosch HDEV6) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single-scroll turbo (Honeywell GT1749V) | |
| Timing system | Chain-driven (double-row, front-mounted) | |
| Oil type | Audi Longlife 04 (SAE 5W-30) | |
| Dry weight | 145 kg |
The dual-injection system provides strong mid-range torque and smooth throttle response but requires adherence to 15,000 km oil change intervals to prevent HPFP cam wear. Audi Longlife 04 (5W-30) oil is essential due to its anti-wear additives protecting the high-pressure pump drive. Extended idling should be minimized to maintain oil pressure at the cam follower. The Bosch HDEV6 fuel pump demands premium unleaded fuel (RON 98) to prevent knock and injector coking. Post-2020 models feature revised HPFP components; pre-2020 units should be inspected per Audi SIB 2019-22-01. PCV system maintenance is critical to prevent oil ingestion and carbon buildup in the intake manifold.
Oil Specs: Requires Audi Longlife 04 (5W-30) specification (Audi SIB 2019-22-01). Supersedes ACEA A3/B4 standards.
Emissions: Euro 6d certification applies to all CMUA models (2019–2023) (VCA Type Approval #VCA/EMS/6794).
Power Ratings: Measured under SAE J1349 standards. Full output requires RON 98 fuel (Audi TIS Doc. A34607).
Audi Technical Information System (TIS): Docs A34124, A34318, A34607, SIB 2019-22-01
VCA Type Approval Database (VCA/EMS/6794)
SAE International: J1349 Engine Power Certification Standards
The Audi CMUA was used across Audi's B9.5/4H platforms with longitudinal mounting and shared with Volkswagen and SEAT under Group platform strategy. This engine received platform-specific calibrations-tuned intake manifolds in the A6 and revised cooling in the A7-and from 2021 the facelifted A5 Sportback adopted revised emissions mapping, creating minor software incompatibilities. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front cylinder block near the timing cover (Audi TIS A34154). The 8th VIN digit indicates engine family ('C' for EA888 Gen 4). Pre-2021 models have silver valve covers with black plastic timing covers; post-2021 units use black valve covers. Critical differentiation from EA888 Gen 3B: CMUA features Bosch HDEV6 fuel pump and revised ECU calibration. Service parts require production date verification - HPFP assemblies before 12/2019 are incompatible with later units due to cam profile redesign (Audi SIB 2019-22-01).
The CMUA's primary reliability risk is high-pressure fuel pump cam wear on early builds, with elevated incidence in city driving with frequent cold starts. Internal Audi reports from 2020 indicated a significant number of pre-2020 engines required HPFP replacement before 100,000 km, while UK DVSA records show increased misfire-related MOT failures in urban areas. Short trips and delayed oil changes accelerate wear, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2019-2022) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CMUA.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with AUDI or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
AUDI Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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)
UK type-approval authority for automotive products.
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.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialAUDI documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
