SOURCE: My check engine light came on my car about a year
You have to pull the codes, do not guess, waaaaay too expensive...THe purge system bleeds tank fumes into the intake system, for clean burning.... Something (was at least) is worng, pull the codes and proceed.
The Check Engine Light (yellow light) comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system you will seldom feel the car engine run any different, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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