The fourth-generation Seat Leon (codename KL) is based on the Volkswagen Group's MQB Evo platform, shared with the Golf 8, Audi A3 (8Y), and Skoda Octavia IV. Positioned as the dynamic and affordable alternative within the group, it stands out with a sharp design and incisive road handling. While the mechanical base is largely proven and very reliable (especially the EA211 evo family TSI petrol engines), this generation was heavily marred at its launch by major software issues related to the MIB3 infotainment system and driver assistance systems. Models produced from late 2022 onwards (or updated with software versions 1896/1940+) offer a significantly more serene experience. The range of powertrains is extensive, from classic petrol to plug-in hybrid, including mild-hybrid (eTSI) and CNG.
The Seat Leon IV is an excellent compact car mechanically and dynamically. The petrol engines (1.5 TSI and eTSI in particular) are benchmarks in their category in terms of driving pleasure and reliability. However, buying a used model requires absolute vigilance regarding the electronics. Avoid un-updated 2020-2021 models if possible. Prioritize a late 2022 model or ensure, with supporting invoices, that the vehicle has received the major software updates (MIB3) and hardware fixes (steering wheel). If these conditions are met, it is a highly recommendable purchase, often smarter than a Golf 8.