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Not starting when cold could also be a bad ignition module/coil.

Which could show as lean to the O² sensor, and cause misfire codes - code(s) depending on how many bad/weak coils there are.

Random misfires could be a grounding issue, too (Calibers are known for this).

Running lean would heat up the engine.

Unburned fuel from a bad coil would heat up the catalytic converter.

But sensors first - they're cheap, "easily" installed, and probably at their end of lifespan anyway.

Have you tried starting it with your spare key?
 
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