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yes its because a bad ac pump may be locking their for creating more stress on the engine, mainly on idle the engine might try to turn off or run rough their for creating a check engine light low engine power. or cylinder miss fire..............EXCUSE ME but i feel the vehicle owners should be informed.... Iam new to this site but am i the only tech. in this house? I love learning things and iam praying the other subjectcs of my intersst were NOT the same type ive found here.I do not wear a cape, but ive had to re on EVERY AUTO QUESTION i came across...... I would like to elaborate on your question,when you say bad do you meen inop ? iis it cycling,does it click off and on ? bad is a very tough word for a technician.the a/c compressor,if it did seize up your belt would would squeel or seize up.but as the norm,unless you own a Dodge p.u. the check engine light could be anything that has to do with the pcm,or ecm.

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Q: Would a bad AC pump cause the engine light?
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