2002 Chrysler Sebring 2.7 evap code and gas cap?

Answer 1

Every car made since 1996 has OBD-II.

Please read the "On-board Diagnostics" article on Wikipedia.

All cars with OBD-II perform a test of the evaporative emissions system regularly.

Gasoline evaporates, and if the vapors are not captured and used, they will escape into the air, which is harmful to the environment and human health.

If the gas cap is not tightened enough, the car will fail it's own test. (generally, you will hear and feel a clicking when the torque limiter in the gas cap engages, indicating the cap is adequately tightened)

My advice is to tighten the gas cap adequately, clear the code, which will turn off the "check engine" light. (if you do not have the proper scan tool to do this, the code can be cleared by disconnecting the negative battery cable overnight, however you will lose presets such as the radio station presets and clock time, also your car will have to re-learn the necessary fuel trim, so it may feel slightly 'different' for a few days.

Any cracked vapor hose between the tank and engine will also cause this code.