The CEL is only turned on when an error is found. Autozone should have been able to tell you which codes are active.
The message center will tell you when you need service, based on miles and usage.
Chipmunks also chew wires. No, they will not get into the turbo. How in the heck did they get into the airbox? If they chewed through the air intake hose, that will be the cause of the CEL.
Losing coolant: check the hose from the coolant bottle to the engine for leaks. Also check the passenger side of the radiator for leaks. Use a clean paper towel to wipe the areas after the engine has heated up and is turned off (maximum pressure).
If it is a head gasket, a compression test will let you know.
Your car is also old enough to start having heater core issues.
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Keeping it running is better than buying new
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