why do i have to put air in my tires every other week
If you have cast aluminum rims there have been some bulletins concerning porosity issues (leaking at edge of rim) Don't know if you have all tires doing this or not but my thoughts are that the inside rims edges would have to be cleaned up and perhaps bead seal put on. The only other idea is that the valve stems are leaking but would think this would be isolated to just one wheel. If that's what the issue is you can DIY and tighten with a valve tool. Good Luck!
I would replace all the valve stems but some tires leak air even if there are not any nails in them. Porous wheels are a possibility. Have a tire shop dunk your tires and look for leaks.
Search Saturn Aura Questions
Saturn Aura Experts