Alignment Check - During the test drive, while on a somewhat even road, let go of the steering wheel for a few moments and see if the vehicle drifts to one side. Keep in mind, most roads have "road crown" and will slightly cause all cars to drift to the right, but a barely noticeable amount.
Transmission Check - Make sure the test drive takes at least 15 minutes, ask the seller for permission first. This will allow the transmission to fully warm up. For automatics, issues could potentially arise online when hot, and not be present when cold. You will feel jerkiness when the auto transmission is malfunctioning. For manuals, do a clutch test by engaging 4th gear at a slow speed and go wide open throttle - see if the clutch slips (the rpms will climb extremely fast like you are in neutral).
Wiggle Test - At about 30 mph roll down your windows do a few quick left to right steering wheel maneuvers. Listen to the suspension and chassis - it should not make ANY noises while doing this.
Suspension Check - Go over some bumpy roads, and take some angled driveways / turns. Listen for any binding suspension components which will present itself with a loud knock. Also listen for failing wheel bearings by rolling up all your windows and checking for a loud whirring rotational noise.
Interior and Features - Finally, check all the features. This means A/C, reverse camera, navigation, etc. Check all window motors by rolling up and down the windows. Make sure everything is working to your desire.
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