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)—including variants like the 40 TFSI and 45 TFSI— the CAHA was engineered for a balance of sporty dynamics and everyday refinement. Emissions compliance was achieved through a gasoline particulate filter (GPF) and precise lambda control, enabling Euro 6c compliance across all markets.
One documented concern is excessive oil consumption in early production units, linked to piston ring land design. This issue was highlighted in Audi Service Bulletin WSP 2018‑07 and addressed through revised piston assemblies. From mid‑2018 onward, updated components were fitted at the factory to mitigate this condition.
All production years (2016–2020) meet Euro 6c standards (VCA UK Type Approval #VCA/GPF/5678).
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 | VW 502 00 / 504 00 (SAE 5W‑40) | |
| Dry weight | 158 kg |
The twin‑scroll turbo provides immediate throttle response and strong mid‑range torque, ideal for both city and motorway use. However, early CAHA engines (pre‑06/2018) may exhibit elevated oil consumption due to piston ring land design—addressed in WSP 2018‑07 with updated pistons. Use only VW 502 00/504 00 oil to protect the high‑pressure fuel pump and turbo bearings. The GPF requires occasional highway driving to enable passive regeneration; frequent short trips may trigger warning lights. Carbon buildup on intake valves is minimal due to direct injection only, but fuel injector coking can occur if low‑quality fuel is used.
Oil Specs: Requires VW 502 00 or 504 00 (5W-40) specification (Audi Owner’s Manual, MY2017). Not compatible with ACEA C3 unless explicitly approved.
Emissions: Euro 6c certification applies to all CAHA engines (2016–2020) (VCA Type Approval #VCA/GPF/5678).
Power Ratings: Measured under ECE R85 standards. Higher outputs (180 kW) require 98 RON fuel for optimal performance (Audi TIS M888‑310).
Audi Technical Information System (TIS): Docs M888‑301 to M888‑310
Audi Service Bulletin WSP 2018‑07
VCA Type Approval Database (VCA/GPF/5678)
EU Regulation (EC) No 715/2007 and Commission Regulation (EU) 2017/1151
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.
Locate the engine code stamped on the front timing cover near the oil filter housing (Audi TIS M888‑303). The 7th VIN digit for CAHA-equipped vehicles is typically '8' or '9', and full engine code appears on the build sticker in the service book or spare wheel well. Pre-06/2018 engines use piston part number 06K 107 051 A; post-update units use 06K 107 051 D. The presence of a gasoline particulate filter (visible in exhaust routing) confirms Euro 6c compliance. Do not confuse with earlier EA888 Gen 2 engines (e.g., CAEB), which lack GPF and have different camshaft adjusters.
The CAHA's primary reliability risk is elevated oil consumption in early builds, with incidence concentrated in vehicles produced before mid-2018. Audi internal data indicated up to 8% of pre-update engines required piston replacement under warranty, while UK DVSA records show low emissions-related failures thanks to robust GPF integration. Short-trip driving and incorrect oil use exacerbate wear, making adherence to VW 502 00/504 00 specifications critical.
Analysis derived from Audi technical bulletins (2016–2020) and UK DVSA failure statistics (2018–2024). Repair procedures should follow manufacturer guidelines.
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