Mercedes-Benz E350 auxiliary battery malfunction warning after replacement on Mercedes-Benz E350

Some Mercedes-Benz E350 owners report experiencing persistent auxiliary battery malfunction warnings even after replacing the battery. These warnings may indicate ongoing issues with the auxiliary battery system, as the vehicle's onboard diagnostics can continue to detect malfunctions. Additionally, owners are advised to verify the voltage levels of both the main and auxiliary batteries, as incorrect voltage readings could signal further problems. The location of the auxiliary battery can vary by model, and knowing its placement is essential for effective troubleshooting. Furthermore, it is generally not recommended to drive with a faulty auxiliary battery, and if the replacement does not resolve the warning, professional assistance may be necessary to investigate the underlying issues.