Another consideration - are you still running the 6 year old OEM tires? Is your cabrio garage kept or outdoors?I have a 2008 Cabrio with original tire sizes. I'm going on a road trip soon and would feel safer if I had a spare with me.
The TPMS only reads the wheels that are rolling. I've had a former front wheel as a spare (all wheels/ tires are the same on mine) and I have neglected to check the "spare's" pressure once . The TMPS didn't know the difference. As long as all your tires have sensors you would just need to press the button on the dash to reset the monitor and all should be fine.Just a thought - how will the TMPS work if you have a flat tire in back and 4 healthy tires on the ground? Seems like the system can't read 5 tires. Or will the spare even have a pressure sensor? Or does the system switch off easy enough? I've seen the button on the dash but have no idea how any of it works. I know my son has a VW Jetta that has been showing a TMPS error for quite a while but drives fine.