The Audi CTXA is a 1,984 cc, inline — four turbocharged petrol engine produced between 2017 and 2021. It belongs to the Volkswagen Group’s EA888 Gen 3B engine family, featuring direct fuel injection (FSI), variable valve timing (VVT), and an integrated exhaust manifold for improved thermal efficiency. In standard tune, it produces 140 kW (190 PS) and 320 Nm of torque, delivering responsive performance with strong mid — range pull across Audi’s compact and mid — size lineup…
All CTXA engines comply with Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/6129), verified under RDE testing for real-world emissions.
The Audi CTXA is a 1,984 cc inline-four turbo petrol engineered for compact and mid-size models (2017–2021). It combines turbocharging with direct injection and dual variable valve timing to deliver responsive mid-range performance. Designed to meet Euro 6d-TEMP standards, it balances sporty driving dynamics with modern emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,984 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 140 kW (190 PS) @ 4,200–6,000 rpm | |
Torque | 320 Nm @ 1,500–4,100 rpm | |
Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 9.6:1 | |
Cooling system | Water-cooled with dual-circuit thermostat | |
Turbocharger | Single-scroll turbo with integrated exhaust manifold | |
Timing system | Chain-driven (front-mounted; wear-prone under poor maintenance) | |
Oil type | Audi Longlife 05 (SAE 5W-40) or 050 (5W-30) | |
Dry weight | 142 kg |
The Audi CTXA was used across Audi's MQB platform with transverse mounting and shared within the Volkswagen Group for longitudinal applications in select models. This engine received platform-specific adaptations-shorter intake tracts in the A3 and revised cooling routing in the Q3-and from 2018 the facelifted A4 B9 adopted the updated EA888 Gen 3B variant with enhanced oil control, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CTXA's primary reliability risk is timing chain wear on early builds, with elevated incidence in short-trip urban use. Internal Audi quality reports from 2018 indicated a significant share of pre-2018 engines requiring chain inspection before 150,000 km, while UK DVSA records show increased catalytic converter failures linked to oil consumption in poorly maintained units. Cold-start cycles and extended oil intervals increase chain and guide stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2017-2020) and UK DVSA failure statistics (2018-2023). 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 CTXA offers strong performance and efficiency, but early models (2017–2018) had timing chain concerns under poor maintenance. Later revisions (post-2018) improved oil control and tensioner design, enhancing durability. Regular servicing with Audi-approved oil (5W-40 Longlife 05) and timely inspections greatly improve long-term reliability.
Key issues include timing chain wear, turbocharger wastegate sticking, intake valve carbon buildup, and oil leaks from valve cover gaskets. These are documented in Audi service bulletins and field reports. Proper maintenance significantly reduces the likelihood of major failures.
The CTXA was used in the A3 (8Y), A4 (B9 facelift), and Q3 (8U post-2018). It also appears in select Volkswagen models like the Golf R (Mk7.5) as part of the EA888 family. All applications are petrol variants meeting Euro 6d-TEMP standards.
Yes. The CTXA responds well to ECU remapping, with stage 1 tunes typically adding +30–50 kW. Stock internals support moderate tuning, but supporting mods (intercooler, exhaust) are recommended. Tuning should be performed by specialists familiar with EA888 thermal management.
In real-world driving, expect 7.0–8.5 L/100km (33–38 mpg UK) in mixed conditions. Highway efficiency improves to ~6.0 L/100km (~47 mpg UK). Fuel consumption varies with driving style and vehicle weight, but the engine's thermal efficiency helps maintain strong economy for a turbo petrol.
Yes. The CTXA is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. Immediate attention to any timing-related rattles is essential to avoid costly repairs.
Audi specifies 5W-40 Longlife 05 or 5W-30 Longlife 050 synthetic oil. Oil changes should occur every 15,000 km or annually. Using correct oil is critical for timing chain lubrication and turbocharger longevity.
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.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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