2023 Toyota Gr86 Engine Problems

Your engine stalled while driving at 139 MPH, and the vehicle wouldn't restart. The dealer diagnosed a complete engine failure requiring engine replacement. The dealer denied warranty coverage, claiming the failure resulted from customer abuse, even though your car is designed for a maximum speed of 140 MPH. A full engine replacement would be needed to restore the vehicle to working condition.

Your spark plug failed suddenly while driving at highway speeds, causing cylinder 4 to misfire and making your car undrivable. The dealership service advisor confirmed this has happened to multiple other 2023 GR86 models. Your mechanic has replaced the spark plug and coil pack, but your head gasket also needs replacement to fully resolve the issue.

Your engine is leaking oil from the spark tube seals in the valve cover gasket, which creates a fire hazard since hot oil can drip onto the exhaust system and ignite. The dealership only replaces the cracked seals they find, but this is a known issue on your model where all seals should be replaced as a preventative measure. The fix involves replacing all the spark tube seals and valve cover gasket to prevent future leaks.