check engine light

timer Asked: Oct 25th, 2013
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Question Description

Chev impala 2010.  Check engine light comes on and stays on awhile, then goes off and stays off for a few days then comes back on.

Tutor Answer

School: University of Maryland

This happens to my dads car often too. Here are a couple of things that could cause this to happen.

1. You may need to replace the oxygen sensor. Over time, the sensor gets covered in oil ash and it reduces the sensors ability to change the oxygen and fuel mixture. A faulty sensor not only reduces gas mileage, it also increase emissions.
2.You could have a loose or faulty gas cap
3.You may need to replace spark plugs or wires
4. You may need to replace the mass airflow sensor
5. You may need to replace the catalytic converter

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Thanks, good work

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