Pro­gram­ming re­mote key

Car Mechanics (UK) - - Help! -

My grand­daugh­ter re­ceived two keys with the 2005 smart fortwo cabri­o­let she bought re­cently. One re­mote works fine, but the other one prob­a­bly needs a new bat­tery. If we re­place the bat­tery will the re­mote need to be syn­chro­nised with the car?

Dave Fisher

As the sys­tem does work with one key, re­plac­ing the bat­tery on the se­cond key should re­store its op­er­a­tion. If the prob­lem is more than a failed bat­tery, the keys can only be re­pro­grammed us­ing di­ag­nos­tic equip­ment. Be­fore re­plac­ing the bat­tery, en­sure that the se­cond key will op­er­ate the ig­ni­tion and start the en­gine, which will con­firm whether the im­mo­biliser chip has been af­fected.

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