The Audi CGWB is a 1,968 cc, inline-four turbocharged diesel engine produced between 2018 and 2023. It belongs to the Volkswagen Group’s EA288 evo diesel engine family, designed for Euro 6d emissions compliance and improved real-world efficiency. Featuring common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC), it delivers 110 kW (150 PS) with peak torque of 360 Nm available from 1,750 rpm, offering strong mid-range pull for daily driving and motorway cruising.
Fitted to models such as the A4 (B9), A6 (C8), and Q5 (FY), the CGWB was engineered for drivers prioritising refined performance and low CO₂ output. Emissions control is achieved through a dual-loop exhaust gas recirculation (EGR) system, a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, meeting strict Euro 6d-TEMP and Euro 6d standards. The engine features an electric coolant pump for faster warm-up and enhanced thermal management.
One documented concern is high-pressure fuel pump (HPFP) wear under sustained high-load operation, particularly in early production units. This issue, referenced in Audi Technical Service Bulletin 2019-21, is linked to marginal lubrication in the Bosch CP4-based fuel system. In 2020, Audi introduced an updated HPFP housing and revised oil formulation requirements (VW 504 00 → 504 00/507 00) to improve lubricity and reduce premature pump wear.
All CGWB models comply with Euro 6d-TEMP (2018–2020) and Euro 6d (2020–2023) standards (VCA UK Type Approval #VCA/EMS/7890); SCR system requires AdBlue refills to maintain emissions compliance.
The Audi CGWB is a 1,968 cc inline-four turbocharged diesel engine developed for premium Audi models (2018–2023). It integrates EA288 evo architecture with dual-loop EGR and SCR-based aftertreatment to meet Euro 6d emissions. Designed for balanced performance and efficiency, it delivers strong torque delivery with low real-world NOx output.
| 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 | 81.0 mm × 95.5 mm | |
| Power output | 110 kW (150 PS) @ 3,250–4,200 rpm | |
| Torque | 360 Nm @ 1,750–3,000 rpm | |
| Fuel system | Bosch CRS 2.0 common rail (up to 2,000 bar), CP4 HPFP | |
| Emissions standard | Euro 6d-TEMP (2018–2020); Euro 6d (2020–2023) | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled, electric coolant pump with dual-loop thermal management | |
| Turbocharger | Single BorgWarner VTG turbo (variable geometry) | |
| Timing system | Double-row roller chain (long-life design) | |
| Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
| Dry weight | 180 kg |
The CGWB's VGT turbo provides strong low-to-mid RPM torque ideal for daily driving but requires strict adherence to 15,000 km oil change intervals using VW 504 00/507 00–compliant oil to prevent HPFP wear and turbo degradation. The SCR system mandates regular AdBlue replenishment (approx. 1 L per 1,000 km) to avoid power derate. Use of ultra-low sulfur diesel (ULSD, EN 590) is essential to prevent fuel system coking. Early 2018–2019 models are prone to HPFP failure; Audi issued TSB 2019-21 recommending inspection and replacement with updated CP4 units. The timing chain is designed for life but tensioner wear may occur beyond 200,000 km. Dual-loop EGR systems require periodic cleaning to maintain flow and prevent regeneration issues.
Oil Specs: Requires VW 504 00 / 507 00 specification (Audi TSB 2019-21). ACEA C3 equivalent acceptable if VW-approved.
Emissions: Certified to Euro 6d-TEMP (2018–2020) and Euro 6d (2020–2023) (VCA Type Approval #VCA/EMS/7890). SCR functionality required for full compliance; AdBlue tank must not be depleted.
Power Ratings: Measured under SAE J1349 standards. Output maintained on standard diesel (EN 590) with functional EGR and SCR (Audi TIS A43109).
Audi Technical Information System (TIS): Docs A43018, A43109, TSB 2019-21
VCA Type Approval Database (VCA/EMS/7890)
SAE International: J1349 Engine Power Certification Standards
The Audi CGWB was used across Audi's B9/C8 platforms with longitudinal mounting and shared with Volkswagen and Skoda under Group modular strategy. This engine received platform-specific adaptations-revised cooling routing in the A6 and enhanced NVH isolation in the Q5-and from 2021 the facelifted A4 adopted a mild-hybrid variant with 48V integration, creating interchange limits. Partnerships enabled shared tooling and calibration across brands. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (Audi TIS A43018). The 8th VIN digit indicates engine type ('C' for CGWB). Pre-2020 models have a Bosch CP4 HPFP with silver housing; post-2020 units use a black housing with revised internal tolerances. Critical differentiation from EA288 base: CGWB uses dual-loop EGR and electric coolant pump, while pre-2018 variants use single-loop cooling. Service parts require production date verification - EGR coolers before 03/2019 are not compatible with later revisions due to flow calibration changes (Audi TSB 2019-21).
The CGWB's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in high-mileage or poorly maintained units. Internal Audi service data from 2021 reported over 20% of pre-2020 units requiring HPFP replacement before 180,000 km, while UK DVSA records show increased NOx-related emissions failures in vehicles with neglected AdBlue systems. Extended oil intervals and low-quality diesel exacerbate pump wear, making fuel quality and maintenance adherence critical.
Analysis derived from Audi technical bulletins (2018-2023) and UK DVSA failure statistics (2019-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CGWB.
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