2004 Mercedes E-Class Owner's Manual - Page 335

Practical hints What to do if ... Display symbol Display messages Reserve fuel Hood open! Key Check battery! Key not recognized! Possible cause The fuel level has dropped below the reserve mark. You are driving with the hood open. The SmartKey with KEYLESS-GO* batteries are discharged. The SmartKey with KEYLESS-GO* is not recognized while the engine is running because the SmartKey with KEYLESS-GO* is not in the vehicle there is strong radio-frequency interference The SmartKey with KEYLESS-GO* is momentarily not recognized. Possible solution Refuel at the next gas station ( page 278). Close the hood ( page 281). Change the batteries ( page 355). Stop the vehicle as soon as it is safe to do so. Search for the SmartKey. Otherwise the vehicle cannot be centrally locked nor can the engine be started again after the engine is stopped. Change the position of the SmartKey in the vehicle. Operate the vehicle with the SmartKey in the starter switch if necessary. A Y F 335