The Audi CAHA is a 1,984 cc, inline‑four turbocharged petrol engine produced between 2016 and 2020. It belongs to the third generation of the EA888 engine family and features direct fuel injection (TFSI), dual overhead camshafts (DOHC), and variable valve timing. Output ranges from 140–180 kW (190–245 PS) with torque between 320–370 Nm, delivering responsive performance and strong mid‑range pull.
Fitted to models such as the A4 (B9), A5 (8T), Q5 (FY), and TT (8S)—includ…
All production years (2016–2020) meet Euro 6c standards .
The Audi CAHA is a 1,984 cc inline‑four turbocharged petrol engine engineered for compact executive and SUV applications (2016–2020). It combines direct injection (TFSI) with a twin‑scroll turbocharger to deliver responsive power and smooth torque delivery. Designed to meet Euro 6c emissions standards, it integrates a gasoline particulate filter for urban air quality compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,984 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged (twin‑scroll) | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 140–180 kW (190–245 PS) | |
Torque | 320–370 Nm @ 1,600–4,500 rpm | |
Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
Emissions standard | Euro 6c | |
Compression ratio | 11.7:1 | |
Cooling system | Water‑cooled with dual‑circuit layout | |
Turbocharger | Twin‑scroll (IHI or BorgWarner, model‑dependent) | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 158 kg |
The Audi CAHA was used across Audi's B9/FY platforms with longitudinal mounting. This engine received platform-specific adaptations—reinforced mounts in the Q5 and revised cooling in the A5 Sportback—and from mid-2018 incorporated updated pistons per WSP 2018‑07, creating minor internal 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.
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Generally yes, especially post-2018 models with updated pistons. Early units (2016–mid-2018) may consume oil excessively, but this was resolved by Audi. With correct oil (VW 502 00/504 00) and regular servicing, the CAHA offers strong performance and durability.
Top issues include oil consumption (early builds), high-pressure fuel pump wear, GPF clogging from short trips, and coolant flange leaks. All are documented in Audi service bulletins, and most are preventable with proper maintenance and driving habits.
The CAHA appears in the A4 B9 (40/45 TFSI), A5 8T (40/45 TFSI), Q5 FY (40/45 TFSI), and TT 8S (45 TFSI) from 2016–2020. It’s part of the EA888 Gen 3 family and always includes a gasoline particulate filter for Euro 6c compliance.
Aftermarket ECU tuning is common on the ANY 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.
In an A4 40 TFSI, expect ~7.8 L/100km city and ~5.6 L/100km highway, or ~42 mpg UK combined. Real-world figures range 38–48 mpg (UK) depending on driving style. GPF-equipped engines may use slightly more fuel during active regeneration cycles.
Yes. Like all modern Audi petrol engines, the CAHA is an interference design. If the timing chain fails (rare but possible), valve-to-piston contact can cause catastrophic damage. Fortunately, the chain is front-mounted and designed for life-of-engine use.
Audi specifies VW 502 00 or 504 00 (5W-40) synthetic oil. Never use ACEA C3 or non-approved oils, as they lack the necessary additives for HPFP and turbo protection. Change intervals should not exceed 15,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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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
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Type-approval guidance and documentation.
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