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hi guys help req the remote keyless fob only works when really close to drivers side handle i have changed the batteries & checked both keys to see if this was the prob but still not working ! i have only had the car 6 months & still under warranty but been informed that i must pay the £85 diagnostic fee if the check is done & its turns out to be not covered !! going to check the rf fuse next any more tips ? thanks
 

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92 500SEL to 01 E320T current 2014 lexus LS460
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In the US keys (electronic) and locks are covered under the new car warranty, unless you have a extended warranty that excludes those items. In the US the MB extended warranty covered all those item except radio and self dimming mirrors.
If your car has the "smart" remote, its output is infra-red, (door & trunk sensor) and RF (radio frequency). On my E class there is a reciever in the passenger side headliner, that could be defective.
 

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2002 honda civic (sold), 2009 Mercedes ML350
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first off what car is this. a defective antenna amplifier module is a usually cause on the c class, sl and clk. other models apply too
 
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