Check here; http://www.obd-codes.com/p0118
It gives a very good explanation of how the system works, what symptoms you might encounter and how to fix it.
In a Pontiac Grand Am error code P0410 means there is an emissions problem.
A P1406 error code on a 1996 Pontiac Sunfire indicates a faulty EGR valve. This can result in poor engine performance and should be replaced immediately.
My guess is you have a faulty temp sensor, replace it.
the code is US0374 in it's American and will be changed to EU6392 if it's been shipped to Europe
check the piece of cardboard where the spare tire is. it should be on there
could be PO118= PO118 Engine Coolant Temp Circuit high =coolant temp sensor. Take to Auto zone or Advanced Auto (if in your area) and they will run a free diagnostic and tell you the code and what the issue is. Mine was the PO118.
Trouble code P0300 means:Random/multiple cylinder misfire detected
how to remove key cylinder on 98 sunfire
the answer is that you need to go to a firestone or certified Pontiac dealership to find out. They have most of the codes on a computer database, but try 4663757AVW556VVC
Trouble code P0449 means: EVAP Vent Solenoid Control Circuit Malfunction
Are you sure about that code? I'm not seeing it in the ODBII code list. http://autorepair.about.com/od/obdcodedatabase/a/OBD_1996_year.htm
cant you need a scanner to check codes from 1996 and newer