We've identified 4 known issues that can affect the 2017–2018 Porsche Boxster / Cayman (718). None are considered critical, but they're worth knowing about before you buy.
The wastegate actuator develops play, causing a rattle and potentially leading to boost issues.
Metallic rattle on cold start or deceleration
Premature failure of the water pump or its vacuum actuator can cause coolant loss.
Low coolant warning, Coolant smell after driving
The air-oil separator can fail internally, causing oil consumption, blue smoke on startup, and rough idle. A common M96/M97-era issue that also affects 718 models.
Blue smoke on startup, Rough idle, Oil consumption, Oil in intake
The PCM system on 718 models can suffer from screen freezes, Apple CarPlay disconnects, and Bluetooth connectivity issues.
Screen freeze, CarPlay disconnects, Bluetooth dropouts