Mercedes-Benz W220 ABS, BAS and ESP lights on after battery disconnection
S500
Why do the W220's ABS, BAS and ESP lights stay on after the battery is disconnected?
Disconnecting the battery or a voltage drop can store harmless fault codes in several control units. That is why the warnings stay on even though nothing is broken. It is worth reading the codes with a diagnostic tool.
How do I get the warning lights to go out after battery disconnection?
Turn the steering wheel from lock to lock and press the brake pedal. The warnings often go out also by driving a few hundred metres, sometimes several kilometres. If the lights are still on, have a workshop investigate, because the brake system is safety-critical.
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