The Audi CFHB is a 1,968 cc, inline-four turbo-diesel engine produced between 2015 and 2020. It belongs to the Volkswagen Group's EA288 engine family, designed for high efficiency and Euro 6 compliance. Featuring common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC), it delivers 110 kW (150 PS) and 340 Nm of torque, with enhanced thermal management and integrated cylinder head for improved cooling.
Fitted to models including the Audi A4 (B9), A5 (B9), and A6 (C7), as well as Volkswagen and Škoda derivatives, the CFHB was engineered for balanced performance and real-world fuel economy. Emissions compliance is achieved via exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling full Euro 6c and Euro 6d-TEMP compliance depending on model year and market.
One documented reliability concern is high-pressure fuel pump (HPFP) degradation under low-fuel conditions, highlighted in Audi Technical Service Bulletin 2016-04-02 (Ref. 612816). Premature wear is linked to fuel starvation and contaminated diesel. From 2017, revised fuel pump calibration and updated fuel tank sender units were introduced to improve fuel level accuracy and prevent dry-running.
Production years 2015–2018 meet Euro 6c standards; 2018–2020 models comply with Euro 6d-TEMP depending on market (VCA UK Type Approval #VCA/EMS/6789).
The Audi CFHB is a 1,968 cc inline-four turbo-diesel engineered for compact and mid-size passenger vehicles (2015–2020). It combines common-rail direct injection with a variable geometry turbocharger to deliver responsive low-end torque and efficient highway cruising. Designed to meet Euro 6c and Euro 6d-TEMP emissions standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,968 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (VGT) | |
| 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 6c (2015–2018); Euro 6d-TEMP (2018–2020) | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled with integrated exhaust manifold | |
| Turbocharger | Single VGT (Garrett GT1544V) | |
| Timing system | Double-row roller chain (long-life, non-serviceable) | |
| Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
| Dry weight | 145 kg |
The VGT turbo provides strong low-RPM torque ideal for urban driving but requires strict adherence to 15,000 km oil change intervals using VW 504 00/507 00 oil to prevent DPF clogging and turbo bearing wear. The Bosch HPFP is sensitive to low fuel levels and poor-quality diesel, increasing risk of cavitation and failure. AdBlue-equipped models require periodic tank refill and SCR system diagnostics. EGR and intake manifolds are prone to carbon buildup, necessitating cleaning every 60,000–80,000 km. Cold starts should be minimized in sub-zero conditions to reduce thermal stress on the EGR cooler.
Oil Specs: Requires VW 504 00 / 507 00 specification (Audi SIB 2013-08-01). ACEA C3 oils acceptable if VW-certified.
Emissions: Euro 6c applies to 2015–2018 models (VCA Type Approval #VCA/EMS/6789). Euro 6d-TEMP compliance from 2018 requires SCR/AdBlue system functionality.
Power Ratings: Measured under ECE R85 standards. Output varies slightly based on calibration and aftertreatment status (Audi TIS Doc. A51272).
Audi Technical Information System (TIS): Docs A51272, A51273, SIB 2016-04-02
VCA Type Approval Database (VCA/EMS/6789)
EU Regulation (EC) No 715/2007
The Audi CFHB was used across Audi's B9/C7 platforms with longitudinal mounting and shared within the Volkswagen Group for transverse and longitudinal applications. This engine received platform-specific adaptations-integrated exhaust manifold in the A4 B9 and revised EGR routing in the A6 C7-and from 2018 the facelifted A5 B9.5 adopted Euro 6d-TEMP compliance with SCR integration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front cylinder block near the timing cover (Audi TIS A51272). The 8th VIN digit indicates engine family ('C' for EA288 series). All CFHB units feature an AdBlue tank with a blue filler cap. Critical differentiation from CDYC: CFHB has integrated exhaust manifold in cylinder head and revised HPFP calibration. Service parts require production date verification—EGR coolers before 03/2018 are incompatible with later corrosion-resistant variants (Audi SIB 2017-06-05).
The CFHB's primary reliability risk is high-pressure fuel pump (HPFP) failure, with elevated incidence in urban-driven vehicles with frequent short trips. Internal Audi field reports from 2017 indicated a measurable increase in HPFP replacements on units with inconsistent fuel levels, while UK DVSA data shows EGR cooler failures contributing to emissions-related MOT failures. Extended oil intervals and low tank levels exacerbate fuel system stress, making adherence to VW 504 00 oil and tank management critical.
Analysis derived from Audi technical bulletins (2015-2018) and UK DVSA failure statistics (2017-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CFHB.
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