This workshop service repair manual covers the Volvo Penta AQ131. While specific production years are not detailed, this internal combustion engine is designed with fuel injection and emission control systems. Its robust engineering is intended to provide reliable performance, and this manual aims to detail its unique features and operational aspects. This comprehensive English-language manual provides step-by-step instructions, detailed illustrations, diagrams, and wiring schematics to assist with maintenance and repair. It covers all major systems including the engine mechanical and electrical systems, clutch, manual and automatic transaxle systems, driveshaft and axle, steering, brake system, body interior and exterior, body electrical system, and restraint system. Troubleshooting guidance is also included, ensuring owners, mechanics, and technicians have the necessary information to maintain the AQ131 effectively.