The Audi CTUC is a 1,968 cc, inline — four turbocharged diesel engine produced between 2018 and 2023. It belongs to the EA288 evo engine family, designed for enhanced efficiency, reduced emissions, and improved reliability over prior generations. Featuring common rail direct injection, variable geometry turbocharging (VGT), and dual overhead camshafts, it delivers 120 kW (163 PS) and 380 Nm of torque, providing strong low — end performance ideal for daily driving and m…
All production years (2018–2023) comply with Euro 6d-TEMP or Euro 6d standards depending on market (VCA UK Type Approval #VCA/EMS/7890).
The Audi CTUC is a 1,968 cc inline-four turbocharged diesel engine developed for longitudinal and transverse applications (2018–2023). It integrates common rail injection with a variable geometry turbocharger to deliver strong low-end torque and efficient highway cruising. Designed to meet stringent Euro 6d emissions standards, it uses SCR/AdBlue technology, iEGR, and a DPF for full compliance while maintaining drivability and serviceability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (variable geometry turbo) | |
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 | Common rail (up to 2,000 bar), Bosch CP4.2 | |
Emissions standard | Euro 6d-TEMP (2018–2020); Euro 6d (2020–2023) | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Variable geometry turbo (BorgWarner VTG) | |
Timing system | Dual chain (primary and secondary) | |
Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
Dry weight | 150 kg |
The Audi CTUC was used across Audi's MLB platform with longitudinal mounting and shared with Volkswagen Group brands. This engine received platform-specific adaptations-integrated exhaust in the cylinder head and revised turbo routing in the A6-and from 2020 the updated EA288 evo variant introduced improved fuel filtration and HPFP revisions, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CTUC's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in regions with variable fuel quality. Internal Audi quality reports from 2019 noted increased HPFP failures in pre-2020 units before 100,000 km, while UK DVSA data links SCR/AdBlue faults to frequent short journeys. Cold-start cycles and extended idling increase chain stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2018-2021) and UK DVSA failure statistics (2020-2023). 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 CTUC offers strong torque and efficiency, but early models (2018–2019) had high-pressure fuel pump concerns. Later revisions (post-2020) improved fuel filtration and pump internals, enhancing durability. Regular maintenance using VW 504 00 oil and 15,000 km service intervals greatly improves long-term reliability, especially in regions with consistent diesel quality.
Key issues include HPFP wear (especially pre-2020), EGR/DPF clogging due to short trips, turbo actuator failures, and AdBlue system faults. These are documented in Audi service bulletins and field reports, with fuel pump failure being the most critical if maintenance or fuel quality is compromised.
The CTUC engine was used in the Audi A4 (B9), A6 (C8), and Q5 (FY) from 2018 to 2023. It was also shared across Volkswagen Group models including the Volkswagen Passat B8 (2.0 TDI). All variants produce 163 PS and meet Euro 6d emissions standards.
Yes. The CTUC responds well to ECU remapping, with stage 1 tunes typically adding +30–40 kW. Stock internals handle increased boost reliably up to 200–210 PS. Supporting mods like intercooler and exhaust improve gains. Tuning should be performed by specialists familiar with EA288 evo fuel system limitations.
In combined driving, the CTUC achieves ~5.2 L/100km (54 mpg UK). Highway efficiency improves to ~4.8 L/100km (59 mpg UK), while city driving may reach 6.2 L/100km (46 mpg UK). Real-world consumption depends on driving style, but 45–55 mpg UK is typical for mixed use.
Yes. The CTUC is an interference engine. If the timing chain fails, pistons can collide with open valves, causing catastrophic internal damage. Immediate attention to chain rattle or oil pressure warnings is essential to prevent engine destruction.
Audi specifies SAE 5W-30 oil meeting VW 504 00 (diesel) or 507 00 (multi) standards. Use of correct oil is critical for timing chain lubrication. Change intervals should not exceed 15,000 km or one year to maintain engine longevity and prevent premature wear.
Comprehensive technical documentation and regulatory references
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AUDI Official Site
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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)
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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.
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