Change the rear brake pads and the idiot light won't stay out. I put on a new sensor and pads with Mercedes brake lining grease. My car won't stop squealing and the idiot light keeps coming back on. I know this is not rocket science but could someone make some suggestions?

Someone told me the lining my have to "wear" in and that is why they squeal. If so what about the idiot light??

Thanks in advance.

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta