How do i get my 07 convertible pt cruiser out of limp mode.

At first we were having problems with it getting hot (not overheating) so we
replaced everything from the thermostate, to cooling fans, checked relays
bought a new radiator cap, drained air from radiator, changed fluid we did
everything we think the new radiator cap did it not sure. But then i noticed it
was acting like it was having trouble accelerating, but everyone said its fine
then check engine light comes on. The codes 007, 882 n i think 1603 so we
took it shop n after 212.00 later he claimed that we needed a new transmission
temperature sensor and to check the wires. Anyways so my question is my
friend bought a relay and is trying to instal the relay and bypass the tipm is this
a good fix or will it only last a little while until it shorts out something else n try
n charge us hella money just so we can have a even bigger problem later can
somebody please tell me what am i saposed to do. Oh yeah also the ABS light
is on and the horn worked sometimes and the front windows dont work
everytime