How do you rectify engine disabled caused by alarm problem in rover 75?

To rectify an engine disabled issue caused by an alarm problem in a Rover 75, start by checking the vehicle's battery and fuses to ensure they are in good condition. Next, inspect the alarm system for any faults or malfunctions, particularly the immobilizer, which may need reprogramming or resetting. If the issue persists, consider using the vehicle's key fob to deactivate the alarm or consult a professional mechanic or dealership for diagnostic assistance. Additionally, running a diagnostic scan can help identify specific error codes related to the alarm system.