Toyota K3 engineThe Toyota K3 engine is a 1. 3L inline 4 engine most commonly found in compact vehicles produced under Toyota and Daihatsu brands. It is part of the K series engine family and is known for its efficiency and reliability. Vehicles that typically use the K3 engine include: Daihatsu Terios (also sold as Toyota Rush in some markets) Daihatsu Sirion Toyota Passo (certain models) Toyota Avanza (early models in some regions) The K3 engine was mainly designed