Check Engine is an "idiot light" that can have hundreds of underlying
meanings, not neccessarily emissions-related. The only way to find out is to
have the code read from on-board computer,then consult repair manual for
exact meaning of that code. Any self-respecting engine repair shop will have
a code reader (and charge you for reading the code), or you can buy one
yourself. Cheapest types are around 40$ on ebay, but you still need a manual
to interpret the code.
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