However, based on typical naming conventions, here are the for this code. Please select the guide that matches your context. Possibility 1: Automotive Diagnostic Test Procedure (Most Likely) Context: VAG Group (Volkswagen, Audi, Seat, Skoda) special tools often use the prefix VAS (e.g., VAS5051, VAS6154). 5257 suggests a specific guided function or test plan within ODIS (Offboard Diagnostic Information System) or ElsaPro.