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2003 Chevrolet Malibu Classic check engine light

my car horn beeps only once. now my check engine light came on any correlation?. thanks for your help.

No.Your horn will not warn you of any engine problems.

Get the codes read and post them here along with the engine type, milage and what your maintenance history is.
Any auto parts store will read the codes for free. They will be in the form of P0123, P0234 etc…