The Audi CNRB is a 1,968 cc, inline — four turbo — diesel engine produced between 2019 and 2023. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC) with dual — mass flywheel integration. In standard output form, it delivers 110 kW (150 PS), with higher outputs reaching 140 kW (190 PS) and torque between 340–400 Nm, providing strong low — end responsiveness for daily driving.
Fitted to models such as the 8Y A3, 8…
All production years (2019–2023) comply with Euro 6 emissions standards depending on market .
The Audi CNRB is a 1,968 cc inline-four turbo-diesel engine designed for compact and mid-size models (2019–2023). It combines Bosch CRS 3-20 common-rail injection with a single variable-geometry turbocharger to deliver responsive low-RPM torque and efficient highway cruising. Engineered to meet Euro 6 emissions standards, it balances drivability with regulatory compliance across European markets.
| 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 | 110–140 kW (150–190 PS) | |
Torque | 340–400 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch CRS 3-20 common-rail (up to 2,500 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 16.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (Honeywell) | |
Timing system | Chain (front-mounted; revised guides post-2014) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 158 kg |
The Audi CNRB was used across Audi's 8Y/8W/3G platforms with longitudinal mounting and integrated AdBlue dosing. This engine received platform-specific adaptations—reinforced mounts in the A6 and revised intake manifolds in the A3—and from 2022 the facelifted A4 B9.5 adopted updated SCR calibration, 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 CNRB delivers strong torque and good efficiency, but early models (2019–2020) had reliability concerns, particularly high-pressure fuel pump failures. Later revisions (post-2021) improved pump durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (5W-30 Audi Longlife-04) greatly aid longevity.
The biggest issues are high-pressure fuel pump failure (leading to hard starts or no-start), turbo actuator sticking, and EGR/intake carbon buildup. Other complaints include oil leaks from the timing cover gasket and occasional DPF regeneration faults. These are well-documented in Audi service bulletins.
This 2.0L diesel was used widely across Audi's lineup (Euro6 era models). It appeared in the A3 (8Y), A4 (8W), A5 (8T), and A6 (3G), with variants including 150 TDI and 190 TDI. It was phased out by 2023 in favor of EA288 evo units with improved efficiency and reduced emissions.
Aftermarket ECU tuning is common on the CNRB 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.
Very good. In an A4 150 TDI (2020), typical consumption is ~6.7 L/100km (city) and ~4.8 L/100km (highway), or about 44 mpg UK combined. Smaller models (A3) with the same engine often achieve slightly better economy. Real-world figures depend on driving style, but expect 42–49 mpg (UK) on mixed roads for a healthy CNRB engine.
Yes. The CNRB series (like most modern Audis) is an interference engine. This means if the timing chain jumps or breaks, pistons can hit open valves, causing serious engine damage. That's why chain maintenance is critical—any warning rattles should be addressed immediately.
Audi specifies a 5W-30 synthetic oil meeting Audi Longlife-04 (or newer) spec. Always use a high-quality oil designed for turbo diesels and change it every 15,000 km or as Audi recommends to ensure proper chain lubrication and minimize soot buildup.
Comprehensive technical documentation and regulatory references
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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)
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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