Injcetion unit control

the evaporative emission system (EVAP) control system pressure sensor has sent high voltage to the ecm or engine control module and triggered this code either the purge valve located under the car by the gas tank has gone bad, or the charcoal canister has become gas soaked and is pressurizing from gas fumes, or the sensor or wires have shorted , there is also a secondary valve located und the cover of the intake that should also be checked for shorts that can trigger this code but usually it is the one under the car that goes out 9 out of 10 times it is from fuel being burped into the evap canister or charcoal canister from the gas tank which is caused from overfilling the tank or mid day heat of 90 or better with a full tank

faulty fuel level sender unit

InInside the drivers door in the back of the storage compartment is the switch to open the fuel door.

No plug to drain gas. Need a machine that will draw gas out of tank. Dealer will have it and most repair shops.

Is the remote control for the locks just not working? If the doors are unlocked, the trunk and cas tank cover should be unlocked as well. I have a slightly later model, but that's how it works with mine. Are you saying that you can manually open the doors with the key, but when you do, it doesn't unlock the gas door like normal? If so ,there's a manual pull tab in the trunk to open the gas tank flap on the same side of the trunk as the gas tank flap. After it's open, you can of course close the gas lid flap again, but it won't lock again if the auto-locking system isn't working. You'll have to get the dealer to replace the motor if it's gone out. This should get you in the gas tank for now though. Good luck!

that can be something as simple as a bad or loose gas cap ... the cap must seal in order to develop a slight vacuum in the tank thats is used by the emmission control system. less likely but possible is damage to the several hoses that go from the tank to the evaporation control system in the engine compartment..
check your gas cap for damaged or missing rubber seal .. or just replace it ... clean the filler tube if needed so that the gas cap will seal properly .. check the flex hose (if any) from the filler nozzle to the tank ...

Have the speed sensor checked, that's mounted on the side of the tranny, that operates the speedometer. As far as the fuel gauge, probably the fuel sending unit is shot which is in the gas tank.

You have a fuel gauge sending unit problem, the gauge is not the problem, the sending unit is in the gas tank, u must remove the gas tank to replace it.

No link, the fuel guage issue is the sending unit in the gas tank is defective, the temp guage may be correct, have you serviced the cooling system lately or ever? What year is the car?