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Take to your local Autozone and they can check light for free. Could be as simple as loose or defective fuel cap. They'll give you good idea where to start.
Next could be your coil or possibly your fuel injector.
Sensor should be located right by oil filter.
Probably just needs more freon.
May be a problems with your u joint if sounds like coming from under car- on drive line.
Should not have relay at all. Sounds like problems with your neutral safety switch.
Coolant temperature sensor does help control some torque converter and shift point. It's inexpensive part would give a shot. Part also helps computer control some fuel injection, timing and egr functions. When part malfunctions should put up a check engine light- have checked at Autozone if so. If not change your fluid and hope for best.
If has check engine light on that may give you answer. Take to your local Autozone for free check if on. If not, change your fuel filter if haven't in last year and check fuel pressure.
Loosen and take off belt at tensioner first. Should be simple- only one bolt holding it. Note some tensioner bolts turn opposite of normal loosening.
You may want to check out evaporative emissions system. Start with fuel cap, check out purge valve and hoses that run from tank to canister and intake. Gas milage will go way down if leaking vapors.