The Audi CLJA is a 1,984 cc, inline — four turbocharged petrol engine produced between 2021 and 2025. It belongs to the Volkswagen Group's EA888 Gen 4 engine family, featuring aluminium construction, direct fuel injection (TSI), and dual overhead camshafts. Delivering 169 kW (230 PS) and 370 Nm of torque, it integrates a 48V mild — hybrid system (MHEV) to enhance throttle response and reduce emissions.
Fitted to models such as the Audi A4 (B9), A5 (F5), and Q5 (FY), the CLJA en…
Production years 2021–2025 meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/9801).
The Audi CLJA is a 1,984 cc inline-four turbocharged petrol engine engineered for performance-oriented Audi models (2021–2025). It combines TSI direct injection with twin-scroll turbocharging, a 48V mild-hybrid system (MHEV), and a gasoline particulate filter (GPF) to deliver strong torque and emissions compliance. Designed for Euro 6d-TEMP, it supports both city 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 | 169 kW (230 PS) @ 5,000–6,500 rpm | |
Torque | 370 Nm @ 1,600–4,300 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 with e-actuator) | |
Timing system | Chain (front-mounted; revised guide design post-2023) | |
Oil type | VW 504 00 / 507 00 (SAE 0W-20) | |
Dry weight | 114 kg |
The Audi CLJA was used across Audi's B9/F5/FY platforms with longitudinal mounting and integrated MHEV control. This engine received platform-specific adaptations-revised cooling routing in the Q5 and updated EGR calibration in the A5-and from 2023 the facelifted A4 adopted the CZJC variant with revised valve timing, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CLJA's primary reliability risk is fuel injector coking on early builds, with elevated incidence in urban short-trip use. Internal Volkswagen quality reports from 2023 indicated a significant number of pre-2023 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 (2021–2025) and UK DVSA failure statistics (2022–2023). 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 CLJA delivers strong performance and good efficiency, but early models (2021–2022) had reliability concerns, especially fuel injector coking. Later revisions (post-2023) improved injector durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (0W-20 VW 504 00) and RON 98 fuel greatly aid longevity.
The biggest issues are fuel injector coking (leading to misfires or rough idle), turbo wastegate actuator sticking, and GPF clogging affecting regeneration. Other complaints include oil leaks from gaskets and occasional MHEV belt tensioner faults. These are well-documented in Volkswagen Group service bulletins.
This 2.0L petrol was used in the Audi A4 (B9), A5 (F5), A6 (C8), and Q5 (FY) between 2021 and 2025. All applications were designated 45 TFSI and met Euro 6d-TEMP emissions standards. It was phased out in favour of the CZJC and CZRB variants in post-facelift models.
Yes. The EA888 Gen 4 platform is highly tunable. ECU remaps can safely gain +60–70 kW on stage 1, as the stock internals handle increased torque. Aftermarket upgrades (intercooler, exhaust) can further boost output. Tuning should be done carefully with supporting modifications to avoid over-stressing the injectors and turbo.
Good for its class. In an A5 45 TFSI (2022), typical consumption is ~9.2 L/100km (city) and ~6.4 L/100km (highway), or about 37 mpg UK combined. Real-world figures depend on driving style, but expect 34–40 mpg (UK) on mixed roads for a healthy CLJA engine.
Yes. The EA888 series (like most modern Audis) is an interference engine. If the timing chain fails, pistons can strike open valves, causing catastrophic engine damage. Chain maintenance is critical—any warning rattles should be addressed immediately.
Audi specifies a 0W-20 synthetic oil meeting VW 504 00 (petrol) or 507 00 (multi-vehicle) specification. Always use a high-quality low-viscosity oil designed for turbocharged direct-injection engines and change it every 15,000 km or annually to ensure proper injector and chain lubrication and prevent sludge buildup.
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.