So I replaced some modules with more expensive ones in my sizzlin new ship, auto-undocked and got a warning that my oxygen's about to run out. Little counter with like three or four minutes and counting. I didn't know that I could go to side menu and turn modules on and off individually. Being close to the station I wanted to jump back in and see what was causing this life support failure, got docking clearance and could not auto dock. At this time I haven't attemped manual dock yet. With the oxygen clock running I carefully got my ship in the station, lined up and was about to dock. Aaand did not have a clue what the X52 button mapping for landing gear was. While I googled it, the station told me to get out for tresspassing so I manually made it back out running into a couple of ships on the way. As soon as was outside, the oxygen clock started ticking again. This time I did not qualify for the landing clearance and blew up due to lack of oxygen. Too bad I wasn't recording because it would be hilarious. So I learned not to go over the power load when replacing modules, but in case life support module doesn't work on the side menu you can turn modules on and off as well as assign priority level.