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Wheel vibration – The GS300 is sensitive to front wheel balance. Make sure you test drive the vehicle at 70-80mph
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Front brake discs – These are prone to warping, any steering wobble under light braking from 60mph indicates a problem.
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Ball joints – Perform full lock turns and try to drive over speed bumps and listen out of knocking noise or loose steering feel.
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Wind noise – Check for noise at 70mph around sunroof, door, mirror and windscreen.
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Door sensors – Open each door in turn and check the door open warning light illuminates on the dashboard. A problem with a sensor is costly as they are integrated into the door lock mechanism.
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Battery – When starting, the engine should turn over very fast. If the car struggles to turn over may indicate a problem with the battery.