The 2015 Kia Optima has 4 recalls, all rated at the highest severity level, with three related to a fire risk from the brake system's anti-lock control unit and one tied to a fuel leak on vehicles that previously received an engine replacement.
Brake fluid can seep inside the anti-lock brake control unit and cause an electrical short, which raises the risk of an engine compartment fire whether the car is parked or in motion. Prior repair attempts under an earlier recall did not fully resolve this issue for some vehicles, which is why multiple filings cover the same underlying defect. The fourth recall applies to vehicles that had their engine replaced under a prior campaign: a fuel leak near an ignition source on those replacement engines creates an additional fire risk.