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 u 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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is this the yellow check engine light?
yes, the yellow check engine light.
it is the bank 2 catalist, what is the most inexpensive way to fix this problem. and does the replacement part have to be new.
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