Human: What precautions should I take before purchasing a used car? Assistant: 

1. Research the vehicle's history. Check to see if the car has been involved in any accidents or has had any major repair work done.
2. Have the car inspected by a certified mechanic to identify any potential issues.
3. Test drive the vehicle to make sure it runs smoothly and check for any warning signs, such as strange noises or vibrations.
4. Get a CarFax report to ensure the car was properly maintained and to make sure the odometer hasn't been tampered with.
5. Ask for copies of the title and registration to make sure the vehicle is actually owned by the seller.
6. Have the seller provide proof of any repairs or maintenance that has been done on the car.
7. Get a vehicle history report from the dealership or a third party to ensure the car was not stolen or flooded.
8. Negotiate the price to make sure you're getting a fair deal.