Engine Assembly for 2023–2025 Toyota RAV4 2.5L (A25AFKS)

The Toyota A25B-FXS is a 2.5-liter, four-cylinder “Dynamic Force” engine designed specifically for hybrid models, commonly found in vehicles such as the RAV4 Prime and the new Camry Hybrid. This engine features a long-stroke Atkinson cycle design—with a bore of 87.5 mm and a stroke of 103.4 mm—thereby achieving exceptionally high thermal efficiency. Furthermore, the engine is distinguished by its high compression ratio of up to 14.0:1, its D-4S fuel injection system (combining direct injection with port injection), and its VVT-iE intelligent variable valve timing technology; these technologies work in concert to effectively optimize both the engine’s power output and fuel economy.