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 engine was engineered for dynamic daily performance with improved real-world efficiency. 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.
One documented concern is high-pressure fuel injector coking under short-trip driving conditions, highlighted in Volkswagen Group Technical Service Bulletin 2022-04-06. The issue stems from carbon buildup on injector tips due to frequent cold starts and low exhaust temperatures. From 2023, revised injector coatings and updated ECU fuel strategies were implemented to reduce deposit formation.
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 twin-scroll turbo and 48V MHEV system provide strong mid-to-high RPM power ideal for spirited driving 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-2023 models feature upgraded injector coatings; pre-2023 units should follow VW TSB 2022-04-06 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 2023-05-09). Supersedes ACEA C5.
Emissions: Euro 6d-TEMP certification applies to all CLJA models (VCA Type Approval #VCA/EMS/9801). No Euro 6c 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. A15500).
Audi Technical Information System (TIS): Docs A15200, A15350, A15420, SIB 2023-05-09
VCA Type Approval Database (VCA/EMS/9801)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped vertically on the right-side cylinder block near the exhaust manifold (Audi TIS A15220). The 8th VIN digit indicates engine family ('C' for EA888 2.0 TFSI). Pre-2023 models have silver valve covers with black plastic cam covers; post-2023 units use black valve covers. Critical differentiation from CZJC: Original CLJA has Bosch MED 17.1.1 ECU with 80-pin connector, while CZJC uses MED 17.8.8 with 100-pin. Service parts require production date verification - fuel injectors and GPF assemblies for engines before 03/2023 are incompatible with later units due to internal redesign (VW TSB 2022-04-06).
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.
Find answers to most commonly asked questions about AUDI CLJA.
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