So everything was going good I checked my o2 sensor fuse it was bad at the time I didn't have another fuse that was 15amp but I noticed the audio fuse was 15amp so I used it for the o2 sensor and put a 10amp fuse in it's place for the audio well now for some reason I don't have power to my amp or my stereo i got a 15amp fuse for the audio and took out the 10amp fuse and put in the 15amp fuse I still have no power to stereo or amp does anyone have any advice on how to fix this

 

You are leaving out a lot of information, which makes it unlikely that anyone can offer any suggestions.

Do you have the stock radio and amplifier, or an aftermarket setup? If aftermarket, what is the make/model of your headunit and amplifier? Did you use a wiring or vehicle adapter for the radio connection? If so, which make/model?

Do you have the Factory Service Manual (FSM) for your Z ? If not, search it out and download it because the wiring diagram information in there will help with your troubleshooting. Also, do you have a Digitial Multimeter (DMM) or "voltmeter" and some familiarity in how to use it?

Why did the fuse for your O2 sensor go bad? Fuses typically only blow when there is a fault somewhere in the wiring or an issue with a device that fuse circuit is feeding.