Either a O2 socket & ratchet or a 22mm wrench. Best find out which sensor first as you could spend lots of money guessing
On the muffler
The sensor is located in the rear exhaust manifold.
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Back side of the engine....mounted in the exhaust manifold.
Most oxygen sensors are either on the exaust headpipe just after the manifold or on the manifold. I don't know where it is exactly on the Lumina but that is where you should start looking.
The oxygen sensor is usually mounted in the exhaust manifold pretty close to where the exhaust pipe bolts on.
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yes
Probably not, but it will certainly cost in fuel, performance and excessive emissions.