The Audi CZGB is a 1,968 cc, inline-four turbo-diesel engine produced between 2010 and 2018. It forms part of the Volkswagen Group's EA288 engine family, designed for modular application across compact and mid-size platforms. Featuring common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC), it delivers 103 kW (140 PS) in standard tune, with peak torque of 320 Nm available from 1,500 rpm.
Fitted to models including the Audi A3 (8V), A4 (B8), A6 (C7), and Q5 (8R), the CZGB was engineered for balanced performance, fuel economy, and emissions compliance. Its driving character emphasizes smooth low-end torque for urban and highway use. Emissions control is achieved via exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling Euro 5 and later Euro 6 compliance.
One documented reliability concern involves EGR and intake manifold carbon buildup, particularly in short-trip driving conditions. This issue, referenced in Audi Technical Service Bulletin 2015-13, results from soot accumulation due to high EGR rates and oil vapour ingress. From 2015, revised EGR coolers and intake manifolds with improved geometry were introduced to mitigate flow restrictions.
Production years 2010–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6b depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Audi CZGB is a 1,968 cc inline-four turbo-diesel engineered for compact and mid-size models (2010-2018). It combines common-rail direct injection with a variable-geometry turbocharger to deliver responsive low-RPM performance and improved fuel efficiency. Designed to meet Euro 5 and Euro 6 standards, it integrates advanced aftertreatment for clean operation.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,968 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged with VGT | |
| Bore × stroke | 81.0 mm × 95.5 mm | |
| Power output | 103 kW (140 PS) @ 3,500–4,000 rpm | |
| Torque | 320 Nm @ 1,500–3,000 rpm | |
| Fuel system | Bosch CRS 2-20 common-rail (up to 2,000 bar) | |
| Emissions standard | Euro 5 (pre-2015); Euro 6b (2015–2018) | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (BorgWarner KP35) | |
| Timing system | Double-row roller chain (long-life design) | |
| Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
| Dry weight | 168 kg |
The VGT provides strong low-end torque ideal for daily driving, but requires regular longer runs to prevent EGR and DPF clogging. Use of VW 504 00 / 507 00 (5W-30) oil is essential to minimise ash content and protect the DPF. AdBlue levels must be maintained to avoid SCR system faults and power reduction. The EA288 block design is robust, but short-trip driving accelerates carbon buildup in the intake manifold. Post-2015 models feature revised EGR routing and intake geometry to reduce flow restrictions. Always follow Audi SIB 2015-13 for EGR system inspection intervals.
Oil Specs: Requires VW 504 00 / 507 00 specification (Audi SIB 2015-13). Ashless formulation critical for DPF longevity.
Emissions: Euro 5 applies to pre-2015 models (VCA Type Approval #VCA/EMS/5678). Euro 6b compliance confirmed for 2015–2018 models with SCR system.
Power Ratings: Measured under SAE J1349 standards. Output remains stable with EN 590 diesel fuel. No power increase in later revisions.
Audi Technical Information System (TIS): Docs A40012, A40221, SIB 2015-13
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Audi CZGB was used across Audi's 8V/B8/C7 platforms with longitudinal mounting and shared within the Volkswagen Group for transverse and longitudinal applications. This engine received platform-specific adaptations-integrated AdBlue tank in C7 and revised EGR routing in 8V-and from 2015 the updated B8.5 facelift adopted Euro 6b-compliant tuning with enhanced SCR control, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the timing cover (Audi TIS A40012). The 7th VIN digit indicates engine family ('C' for CZGB). Pre-2015 models have a silver valve cover with a single EGR pipe on the intake manifold; post-2015 units feature a black valve cover with dual-pipe EGR routing. Critical differentiation from EA189: CZGB has SCR/AdBlue system with tank filler behind fuel cap, while EA189 lacks SCR. Service parts require model year verification - EGR coolers before 2015 are not compatible with post-2015 models due to routing changes (Audi SIB 2015-13).
The CZGB's primary reliability risk is EGR and intake carbon buildup, with elevated incidence in urban driving. Internal Audi service data from 2016 indicated over 30% of pre-2015 units required EGR cleaning before 100,000 km, while UK DVSA records show SCR-related faults as a leading cause of Euro 6 MOT failures. Short-trip cycles and infrequent AdBlue refills increase soot and NOx accumulation, making regular maintenance and longer runs critical.
Analysis derived from Audi technical bulletins (2012-2017) and UK DVSA failure statistics (2016-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CZGB.
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