Here is easy quick video tutorial on how to change your Volkswagen Polo / Passat / Tiguan / Sharan Key battery.
You need a new CR2032 battery along with a flat blade screwdriver or suitable thin object. First, pull up the cover on the rear side of the vehicles key. Then using flat blade screwdriver lever the CR2032 battery out of the battery compartment. Then insert the new battery and push into the battery compartment toward the spring side. Then push battery case into the key housing. Replace discharged batteries only with new batteries of the same voltage rating, size and specification.

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