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Joe Russell Posted on Sep 04, 2017

What can cause the check engine light to be on?

2007 chevrolet cobalt 2.2L the engine run good but the check engine light is on i did check for fault code and the code was P0121 the engine don't stumble when press on the gas pedal so i erase the code and drive the car the code didn't come back what could have cause the check engine light to come on and what does code P0121 mean?

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What causes it to misfire and skip until the tachometer drops to zero?

Check Engine Light and Misfire Due to Ignition Module/Coil ...

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