2016 is 1.6mm thick and 2032 is 3.2mm thick, so the 2032 will look right, but only been 3v each youre only giving your fob half the volts it needs
BAM... AND THERES YOUR SOLUTION NOW GO TO ASDA AND GET SOME BATTERIES
BAM... AND THERES YOUR SOLUTION NOW GO TO ASDA AND GET SOME BATTERIES