The Audi CGXB is a 1,968 cc, inline — four turbocharged diesel engine produced between 2015 and 2018. It belongs to the Volkswagen Group’s EA288 engine family, featuring aluminium construction, common rail direct injection, and dual overhead camshafts (DOHC). In standard tune it delivered 110 kW (150 PS), with peak torque of 340 Nm available from 1,750 rpm.
Fitted to models including the 8V A3, 8V A4, and SEAT Leon ST, the CGXB was engineered for balanced efficiency and resp…
All production years (2015–2018) comply with Euro 6b standards (VCA UK Type Approval #VCA/EMS/6790).
The Audi CGXB is a 1,968 cc inline-four turbocharged diesel engine engineered for compact and mid-size platforms (2015–2018). It combines common rail injection with a variable geometry turbocharger (VGT) to deliver strong mid-range torque and efficient cruising. Designed to meet Euro 6b standards, it balances real-world drivability with emissions compliance through integrated SCR technology.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 81.0 mm × 95.5 mm | |
Power output | 110 kW (150 PS) @ 3,250–4,200 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 6b | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Honeywell variable geometry turbo (VGT) | |
Timing system | Roller chain (front-mounted; revised guides post-2016) | |
Oil type | Audi Longlife 05 (SAE 5W-30) | |
Dry weight | 142 kg |
The Audi CGXB was used across Audi's 8V platforms with transverse mounting and shared within the Volkswagen Group for longitudinal and transverse applications. This engine received platform-specific adaptations-revised cooling routing in the A4 and transmission-specific torque calibration in the A3-and from 2017 the facelifted A3 Sportback adopted the CGXB with SCR integration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CGXB's primary reliability risk is high-pressure fuel pump degradation on pre-2017 builds, with elevated incidence in regions with variable fuel quality. Internal Audi quality reports from 2016 noted a significant share of early engines requiring HPFP replacement before 120,000 km, while UK DVSA records associate a notable portion of emissions-related MOT failures with DPF clogging in stop-start traffic. Short-trip driving and low-quality diesel increase fuel system stress, making fuel quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2015-2018) 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 CGXB delivers solid efficiency and drivability, but early models (2015–2016) had reliability concerns, particularly high-pressure fuel pump wear. Later revisions (post-2017) improved pump durability with updated calibration and service guidance. Well-maintained examples with regular servicing and high-quality diesel (EN 590) can achieve over 150,000 km reliably.
Primary issues include high-pressure fuel pump wear, turbo actuator failure, and EGR/intake carbon buildup. Oil leaks from valve cover gaskets and DPF clogging in urban driving are also common. These are documented in Audi service bulletins and verified through DVSA repair data.
The CGXB was used in the Audi A3 (8V, 2015–2018) and A4 (8V, 2015–2018) as the 2.0 TDI 150 PS variant. It was also shared across the Volkswagen Group in the SEAT Leon, Škoda Octavia, and Volkswagen Golf. All models comply with Euro 6b emissions standards (VCA Type Approval #VCA/EMS/6790) and use SCR with AdBlue for compliance.
Yes. The CGXB responds well to ECU remapping, with stage 1 tunes typically adding +30–40 kW safely. Stock internals handle increased torque, but supporting mods (intercooler, exhaust) are recommended for higher stages. Tuning must respect fuel quality (EN 590) and cooling limits to avoid DPF or EGR issues.
In an A3 2.0 TDI (110 kW), combined consumption is ~4.2 L/100km (~67 mpg UK). Highway figures can reach ~3.8 L/100km (~74 mpg UK), while city driving may exceed 5.0 L/100km (~56 mpg UK). Real-world economy depends on driving style, but 55–65 mpg UK is typical for mixed use.
Yes. The CGXB is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. Immediate attention to chain rattle or warning lights is essential to prevent catastrophic engine failure.
Audi specifies SAE 5W-30 oil meeting Audi Longlife 05 specification. This low-SAPS oil is critical for fuel pump and turbo longevity. Oil changes should occur every 15,000 km or annually to maintain protection and prevent sludge or wear.
Comprehensive technical documentation and regulatory references
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