This workshop service repair manual covers the AL4 / DPO automatic gearbox, a widely used 4-speed automatic transaxle developed through a collaboration between Peugeot and Renault. Produced from the late 1990s through the mid-2010s, this transmission is commonly found in vehicles equipped with 1.4L to 2.0L petrol engines and various HDi diesel engines. The AL4/DPO features sequential shift control, including Tiptronic, sport, and snow modes, all managed by an electronic control unit and a sophisticated valve body. Its engineering quality and reliability are dependent on diligent maintenance, making this manual an essential resource for owners and technicians.

This comprehensive English-language manual provides detailed guidance for the complete overhaul, diagnostics, repair, and maintenance of the AL4 / DPO automatic gearbox. It covers all critical systems, including hydraulic and electronic controls, the valve body, torque converter, planetary gear sets, clutches, bands, and related external components. The manual offers step-by-step procedures for disassembly, reassembly, and component-level repair, along with essential troubleshooting guides, electrical schematics, torque specifications, and diagnostic routines for common issues. This resource empowers mechanics and owners to effectively maintain and repair the transmission, ensuring its optimal performance and longevity.