The Audi CTWA is a 1,968 cc, inline — four turbocharged diesel engine produced between 2016 and 2021. It belongs to the Volkswagen Group's EA288 evo engine family, designed for full Euro 6c compliance and improved real — world emissions control. Featuring common rail direct injection, variable geometry turbocharging (VGT), and dual overhead camshafts, it delivered 110 kW (150 PS) with peak torque of 340 Nm available from 1,750 rpm, providing efficient mid — range perform…
All production years 2016–2021 meet Euro 6c standards (VCA UK Type Approval #VCA/EMS/7890).
The Audi CTWA is a 1,968 cc inline-four turbo-diesel engineered for compact and mid-size platforms (2016–2021). It combines variable geometry turbocharging with common rail injection and dual cam phasing to deliver responsive performance and low emissions. Designed to meet Euro 6c standards, it balances strong torque delivery with everyday efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged with variable geometry turbo (VGT) | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 110 kW (150 PS) @ 3,500–4,000 rpm | |
Torque | 340 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch CRS 2-20 common rail (up to 2,000 bar) | |
Emissions standard | Euro 6c | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled with electric coolant pump | |
Turbocharger | Variable geometry turbo (Garrett GT1749V) | |
Timing system | Chain-driven (double-row primary, single-row secondary) | |
Oil type | Audi Longlife Diesel 05 (SAE 5W-30) | |
Dry weight | 154 kg |
The Audi CTWA was used across Audi's MQB platform with transverse mounting and shared architecture with Volkswagen Group siblings. This engine received platform-specific calibrations-shorter intake runners in the 8V A3 and revised cooling in the 8U Q3-and from 2018 received minor internal updates to the high-pressure fuel system, creating service part distinctions. All adaptations are documented in OEM technical bulletins.
The CTWA's primary reliability risk is high-pressure fuel pump actuator wear in early builds, with elevated incidence in cold climates or short-trip driving. Internal Audi quality reports from 2019 indicated a notable share of pre-2018 engines requiring HPFP replacement before 150,000 km, while UK DVSA records show increased emissions-related failures linked to lean mixture codes. Frequent cold starts and low-quality diesel increase pump stress, making fuel quality and oil interval adherence critical.
Analysis derived from Audi technical bulletins (2016-2021) and UK DVSA failure statistics (2017-2023). 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 CTWA is generally robust when maintained properly, but early models (2016–2017) are prone to high-pressure fuel pump actuator wear. Later revisions (post-2018) improved durability with updated components. Regular oil changes using Audi Longlife Diesel 05 (5W-30) and use of high-quality diesel (EN 590) significantly extend engine life. With proper care, 250,000 km is achievable.
Key issues include high-pressure fuel pump actuator wear (especially pre-2018), EGR and intake carbon buildup, turbo VGT actuator sticking, and valve cover oil leaks. These are documented in Audi service bulletins and field reports. PCV system failure can also contribute to oil consumption and vacuum leaks.
The CTWA engine was used in the Audi A3 (8V), Q3 (8U), and TT (8S) from 2016 to 2021. It is a 150 PS variant of the EA288 evo family, primarily in TDI trims. All units meet Euro 6c emissions standards and support both FWD and quattro drivetrains.
Yes, the CTWA responds well to ECU remapping. Stage 1 tunes typically achieve 180–200 PS safely, as the stock internals handle increased torque. Supporting mods like intake, exhaust, and intercooler upgrades allow higher gains. However, over-tuning without addressing fueling or cooling can accelerate HPFP and turbo wear.
In real-world driving, expect 5.5–6.5 L/100km (43–51 mpg UK) in mixed conditions. Highway driving can achieve ~4.8 L/100km (~59 mpg UK). Performance driving reduces efficiency significantly. The engine’s VGT and common rail system help balance power and economy in daily use.
Yes, the CTWA is an interference engine. If the timing chain fails or jumps, piston-to-valve contact is likely, resulting in severe internal damage. The chain is designed for the life of the engine, but any rattling noise should be investigated immediately to prevent catastrophic failure.
Audi specifies 5W-30 synthetic oil meeting Audi Longlife Diesel 05 (or newer) standards. Oil changes should be performed every 15,000 km or annually. Using correct oil ensures proper lubrication of the timing chain and HPFP, and helps protect emissions components like the DPF, NSC, and SCR systems.
Comprehensive technical documentation and regulatory references
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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
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