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it is possible for a bad battery to make check engine light come on. if the battery wont hold a charge and the car is running mostly off the alternator current. the car usually will idle fine, but when you go to drive it the gauges will do strange things and the car wont run very well when you step on the gas. take it to advance and they will ck the battery for free, if the car will run long enough take the whole car, and they can scan it for stored codes and give you a general idea whats wrong with it

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Q: Would a weak battery cause the check engine light to come on in a 1998 Pontiac Sunfire with a 2.2L engine?
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