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What would make a 1998 Honda Accord cp check engine light be on?

Potential Causes:

-Faulty O2 Sensor

-Faulty catalytic converter

-Faulty gas cap that is not tightened or is broken.

-Vacuum leaks

-Faulty ignition coil

-Faulty spark plug

-Faulty fuel injector

-Faulty head gasket

-Faulty EGR valve

-Faulty fuel pump

-Faulty MAP sensor

-Faulty camshaft or crankshaft sensor

-Faulty thermostat