Mercury Mariner hybrid won't start after not being driven regularly, costly repair needed on Mercury Mariner

Some Mercury Mariner hybrid owners report experiencing starting issues after prolonged periods of inactivity, often due to a dead battery, which is a common culprit in such situations. Others have encountered problems related to a faulty inertia switch, leading to intermittent starting difficulties that can sometimes be resolved by bypassing the switch. Additionally, some owners have noted engine codes indicating low voltage, suggesting potential issues with the battery or charging system that require checking battery health and alternator functionality. Electrical issues, including faulty connections or a malfunctioning starter, have also been reported as reasons preventing the vehicle from starting. Repair costs can vary significantly depending on the underlying problem, with simpler fixes like battery replacement being more affordable compared to complex electrical repairs. It is recommended for owners facing these issues to consult a qualified mechanic for accurate diagnosis and appropriate repairs to ensure their Mercury Mariner hybrid is operational again.