The 2003 Chevrolet Impala is a well-regarded American sedan, part of the seventh generation of the Impala nameplate. Built on the W-body platform, this model offers a blend of comfort and performance, available in trims like the LS and the sportier SS, which features a supercharged 3.8L V6 engine. The Impala is recognized for its robust safety features, earning 5-star frontal crash test ratings and a 'Good' rating for frontal offset impact. With its spacious interior, substantial trunk volume, and a legacy of engineering, the 2003 Impala continues to be a practical choice for daily commuting and family transport. This comprehensive service manual provides detailed information for the 2003 Chevrolet Impala, covering all trim levels. It encompasses a wide range of essential topics, including engine service for the 3.4L V6 and 3.8L Supercharged V6, transmission repair, brake systems, suspension, steering, and electrical systems. Additionally, the manual offers in-depth guidance on maintenance schedules, troubleshooting common issues, diagnostic procedures, and access to technical data and wiring diagrams. This resource is designed to assist automotive technicians, mechanics, and DIY enthusiasts in effectively maintaining, diagnosing, and repairing the vehicle, ensuring its optimal performance and longevity.