I bought a used '04 with 65K miles and it took almost two months to figure out that the left front wheel bearing was going bad. About drove me crazy. Several techs said they couldn't hear anything. I persisted, and finally got my tire shop to lift it with the wheels free. We spun the tires up with the motor running and used a stethoscope to isolate the bad bearing. Got it changed out today, and it's like driving a completely different car.