Flare nut wrenches work great too and can be used in other situations, if you don't want to buy a single/whole socket set for one job.
Quote:
Originally Posted by MX-5RACER
Not sure about the plug on these cars, but with my Miata I am able to get the plug through the box end of a 7/8" combination wrench. 7/8" is the O2 size, using a quality combination wrench I have been able to remove them when my O2 wrench bends too much.
Make sure you get a few of the little anti-seize packets at the parts store. Apply this to the threads ONLY, before you re-install the sensor.
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Also,
buy 22 millimeter for the FRS. Don't buy the "universal" or 7/8: they are just slightly large and you run a high risk of rounding off the sides
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As far as getting another O2 sensor, it doesn't hurt to be prepared. Get a generic replacement at an auto parts store or exact replacement at the dealer in case. At worst, you lose some shoe leather and a restocking fee.
As others have mentioned, the risk is there that the O2 sensor is seized on and the threads simply get mangled when you pull the sensor off. Mine took some elbow grease to get off, but luckily the threads were good.
That being said, it's worth getting an O2 sensor thread chaser as well.