This specific used BMW Z4 is a one-owner certified car with no accident, flood, or fire damage, ensuring a solid foundation of reliability—critical for anyone looking to buy used cars with confidence. Generally, reported common problems for the 2013 Z4 sDrive20i include occasional engine warning light activations (often linked to sensor or injector malfunctions), potential coolant or oil leaks in high-mileage used cars, and minor convertible top seal wear that may cause wind noise at high speeds. Prioritizing regular maintenance cost checks, like timely oil changes and seal inspections, can effectively mitigate most of these concerns, and a well-maintained used Z4 can retain stable performance over long-term use.