I left my McLaren 540C parked for three months, and now the battery is dead. I've replaced the battery, and it can start, but the RPM is stuck at 1500, and all the brake lights are on. What could be the issue?

Come back, bro.

McLaren specialized service is at your service. After replacing the battery, the vehicle configuration needs to be matched.

Power failure protection, go to after-sales service. The 540 is generally still under warranty. Just need to refresh the computer and reprogram it. It's a common issue with McLaren. Start it up occasionally, otherwise a power failure could restrict many functions.

In this case, it might be an issue with the car's computer. If the engine stays at a high RPM for a long time, then it's quite serious. Better to contact after-sales directly.