5 Red Flags When Buying a Used Car: Warning Signs to Walk Away

Flag #1: Mismatched Paint

Different paint colors on different body panels indicate the car has been in an accident and repaired. Have the car inspected under bright lighting or use a paint depth gauge. Original factory paint should be consistent across the entire vehicle.

Flag #2: Rust or Corrosion

Surface rust is one thing, but structural rust is serious and expensive to repair. Check underneath the car, around the wheel wells, and along the bottom of doors. Rust in critical areas means the car’s structural integrity is compromised.

Flag #3: Engine Knocking or Grinding Sounds

If the engine makes knocking sounds on startup or during acceleration, it could indicate serious internal damage. Grinding sounds suggest issues with transmission or belts. These repairs can cost thousands of dollars.

Flag #4: Transmission Slipping

During your test drive, the transmission should shift smoothly. If you feel hesitation, slipping between gears, or grinding sounds, the transmission may need repair or replacement. This is one of the most expensive car repairs.

Flag #5: No Service Records

If the seller can’t provide documentation of regular maintenance, walk away. Poor maintenance history suggests the car wasn’t cared for properly and could have hidden problems waiting to surface after your purchase.

Once you’ve spotted the warning signs, run through our complete used car inspection checklist before making an offer, so you know exactly what to look for. And once you’ve identified a vehicle that passes inspection, protect your investment by reviewing our Extended Warranty Guide.