Codes 21 is high TPS voltage and 22 is low TPS voltage, so
I would suspect your TPS is bad. As far as temperature goes,
your engine was designed to run at 195°-230° all day long,
so that's not hot. However, you can "burp" any air out that
might have gotten into the system by removing the front
radiator cap (if coolant starts coming out as you remove
the cap then reinstall the cap and go to the next step)
and adding coolant until it's full, reinstall the cap, then
add coolant through the rear thermostat cap until it's full,
then without the thermostat but with the cap on start the
engine and let it run for less than a minute. Shut off,
remove the thermostat cap and top off as necessary. Reinstall
the thermostat and cap, then fill the front overflow bottle
to the full mark. Drive the car and check the overflow bottle
level regularly, adding as needed until the level stabilizes
at the FULL HOT mark when fully warmed up.

If you have any doubts about the cooling system's integrity
you can take it to any radiator shop for a free or cheap
pressure test.

JazzMan