Fiat 500L battery issue leading to ESC and check engine light activation, along with sulfur smell and white vapor from exhaust on Fiat 500L

Some Fiat 500L owners report experiencing issues such as the activation of the ESC and check engine light, accompanied by a sulfur smell and white vapor from the exhaust. These symptoms may indicate underlying problems, including low battery voltage, which should be measured during idling and engine revving. Additionally, the check engine light can be triggered by various factors, such as a loose gas cap or faulty sensors. The ESC light may also illuminate due to a malfunctioning brake light switch, a common issue in Fiat 500 models. Furthermore, a sulfur smell could suggest fuel system or catalytic converter issues, while white vapor from the exhaust may signal coolant leaking into the combustion chamber, potentially indicating a head gasket or engine problem. It is recommended that owners seek inspection from a qualified mechanic to diagnose and resolve these serious concerns for the safe operation of their Fiat 500L.