The Audi CRDB is a 1,968 cc, inline — four turbocharged diesel engine produced between 2023 and 2026. It belongs to the Volkswagen Group's EA288 Evo engine family, featuring aluminium construction, common rail direct injection, and dual overhead camshafts. Delivering 110 kW (150 PS) and 360 Nm of torque, it integrates a 48V mild — hybrid system (MHEV) to enhance efficiency and reduce emissions without compromising drivability.
Fitted to models such as the Audi A4 (B9), A5…
Production years 2023–2026 meet Euro 6d-TEMP standards .
The Audi CRDB is a 1,968 cc inline-four turbocharged diesel engine engineered for mainstream Audi models (2023–2026). It combines common rail injection with variable geometry turbocharging and a 48V MHEV system to deliver responsive torque and emissions compliance. Designed for Euro 6d-TEMP, it supports both city and highway driving profiles with active regeneration and AdBlue dosing.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,968 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (variable geometry) | |
Bore × stroke | 81.0 mm × 95.5 mm | |
Power output | 110 kW (150 PS) @ 3,250–4,000 rpm | |
Torque | 360 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch CRS 2-20 common rail (up to 2,200 bar) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Honeywell VNT18) | |
Timing system | Chain (front-mounted; revised guide design post-2025) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 146 kg |
The Audi CRDB was used across Audi's B9/F5/FY platforms with longitudinal mounting and integrated MHEV control. This engine received platform-specific adaptations-revised cooling routing in the Q5 and updated EGR calibration in the A5-and from 2025 the facelifted A4 adopted the CZRB variant with revised valve timing, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 CRDB delivers strong torque and good efficiency, but early models (2023–2024) had reliability concerns, especially high-pressure fuel pump failures. Later revisions (post-2025) improved HPFP durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (0W-20 VW 504 00) greatly aid longevity.
The biggest issues are high-pressure fuel pump wear (leading to misfires or stalling), turbo actuator sticking, and DPF saturation affecting regeneration. Other complaints include oil leaks from gaskets and occasional MHEV belt tensioner faults. These are well-documented in Volkswagen Group service bulletins.
This 2.0L diesel was used in the Audi A4 (B9), A5 (F5), A6 (C8), and Q5 (FY) between 2023 and 2026. All applications were designated 35 TDI or 40 TDI and met Euro 6d-TEMP emissions standards. It was phased out in favour of the CZRB and CZJC variants in post-facelift models.
Aftermarket ECU tuning is common on the CRDB platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Excellent for its class. In an A4 35 TDI (2024), typical consumption is ~6.0 L/100km (city) and ~4.6 L/100km (highway), or about 51 mpg UK combined. Real-world figures depend on driving style, but expect 48–56 mpg (UK) on mixed roads for a healthy CRDB engine.
Yes. The EA288 series (like most modern Audis) is an interference engine. If the timing chain fails, pistons can strike open valves, causing catastrophic engine damage. Chain maintenance is critical—any warning rattles should be addressed immediately.
Audi specifies a 0W-20 synthetic oil meeting VW 504 00 (diesel) or 507 00 (multi-vehicle) specification. Always use a high-quality low-viscosity oil designed for turbocharged diesel engines and change it every 15,000 km or annually to ensure proper HPFP and chain lubrication and prevent sludge buildup.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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
Type-approval guidance and documentation.
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