BMW 335d reduced power and no start issue with countdown warning on BMW 335d

Some BMW 335d owners report experiencing reduced power and no-start issues accompanied by a countdown warning. These problems may be triggered by issues with the battery and electrical components, leading to a reduced engine power warning that affects performance. Additionally, some owners find that their vehicle enters limp mode even without a visible warning light, indicating the need for diagnostic fault code readings. Common causes of reduced power include software glitches, throttle body issues, mass airflow sensor problems, and vacuum leaks. In some cases, refilling the diesel exhaust fluid has been noted to reset the "no start" warning countdown. To resolve no-start issues, it is recommended that owners replace worn components, maintain electrical connections, and diagnose or replace faulty starter motors. Furthermore, resetting certain warnings may require actions like replacing NOX sensors and using diagnostic tools, along with driving the vehicle to clear the no-start condition.