The Audi CTUB is a 1,968 cc, inline — four turbocharged diesel engine produced between 2018 and 2024. Part of the Volkswagen Group's EA288 evo diesel engine family, it features common rail direct injection (up to 2,500 bar), variable geometry turbocharging (VGT), and dual overhead camshafts (DOHC). It delivers 120 kW (163 PS) and 380 Nm of torque, meeting strict Euro 6d — TEMP and Euro 6d emissions standards through integrated SCR/AdBlue dosing, dual — loop EGR, and a gasoli…
Production years 2018–2020 meet Euro 6d-TEMP standards; 2021–2024 models comply with full Euro 6d depending on market .
The Audi CTUB is a 1,968 cc inline-four turbocharged diesel engine engineered for mid-size and premium SUV models (2018–2024). It combines EA288 evo architecture with variable geometry turbocharging and SCR/AdBlue aftertreatment to deliver strong low-RPM torque and regulatory compliance. Designed to meet Euro 6d standards, it balances performance with emissions control in real-world conditions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (VGT) | |
Bore × stroke | 81.0 mm × 95.5 mm | |
Power output | 120 kW (163 PS) @ 3,250–4,200 rpm | |
Torque | 380 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch HPI common rail (up to 2,500 bar) | |
Emissions standard | Euro 6d-TEMP (2018–2020); Euro 6d (2021–2024) | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Variable geometry turbo (BorgWarner KP39 evo) | |
Timing system | Chain-driven (longitudinal rear-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 180 kg |
The Audi CTUB was used across Audi's B9/FY platforms with longitudinal mounting. This engine received platform-specific calibrations-revised intake runners in the A5 and enhanced cooling layouts in the Q5-and from 2021 the facelifted A4 models adopted EA288 evo updates with revised EGR cooler routing, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 CTUB delivers strong torque and good efficiency, but early models (2018-2020) had reliability concerns, particularly EGR cooler degradation under high load. Later revisions (post-2021) improved cooler and coolant system durability, so well-maintained examples can be robust. Regular servicing with VW 504 00 oil and avoiding prolonged high-load operation without cooldown greatly enhance longevity.
Key issues include EGR cooler failure (especially under sustained load), EGR and intake carbon buildup, DPF clogging from short trips, and valve cover oil leaks. These are documented in Audi service bulletins and supported by UK MOT failure data. Proper maintenance and driving habits significantly reduce these risks.
The CTUB 2.0 TDI was used in the Audi A4 (B9, 2018–2024), A5 (B9, 2018–2024), and Q5 (FY, 2018–2024). It was phased out in favour of newer diesel architectures post-2024. All applications were longitudinally mounted all-wheel-drive configurations.
Aftermarket ECU tuning is common on the CTUB platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In combined driving, the CTUB achieves approximately 5.0–5.5 L/100km (57–51 mpg UK). Highway efficiency is better (~4.4 L/100km), while city driving may reach 6.2 L/100km. Real-world economy depends on driving style and aftertreatment system health.
Yes. The CTUB is an interference engine. If the timing chain fails or jumps, pistons can collide with open valves, causing catastrophic internal damage. Immediate attention to any timing-related rattles is essential to avoid major engine repairs.
Audi specifies SAE 5W-30 oil meeting VW 504 00 (diesel) or 507 00 (multi) standards. Use only high-quality synthetic oils designed for turbocharged diesel engines and change every 15,000 km or annually to protect the fuel pump and aftertreatment systems.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
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