1. Body Structure: Use a paint thickness gauge to measure the entire vehicle's paint thickness (factory paint typically ranges from 100-150μm, while repainted areas exceed 300μm); Focus on checking the A/B/C pillars, frame rails, and firewall for signs of cutting or welding. 2. Engine Bay Inspection: Check for tool marks on bolts (e.g., hood bolts, radiator support); Inspect for oil leaks (common in turbocharged engines) and belt wear. 3. Undercarriage Inspection (Lift Required): Examine the chassis for rust, underbody damage, and suspension issues (e.g., leaking shock absorbers). 4. SOH Testing: Battery State of Health Detection for Electric Vehicles.