Home > categories > Automotive & Motorcycle > Auto Lighting System > How to reset the yellow steady check engine light code PO442 on 2006 Chevy Cobalt LS sedan 2.2L 113800 miles?
Question:

How to reset the yellow steady check engine light code PO442 on 2006 Chevy Cobalt LS sedan 2.2L 113800 miles?

The steady yellow check engine light has been on for over two weeks and I replaced the gas cap and had a mechanic do the smoke test and nothing could be found wrong or no leaks and engine light did not come off, How can I reset the code or check engine light to come off on my car?

Answer:

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That code means that there is a small leak in the evap control system. This is most often related to the gas cap. You can change the gas cap and it might or might not take care of the problem. The light can be reset if the problem is corrected or the light will go out by itself after three successive starts without a leak detected.
If the check engine light is from the gas cap, the code will reset itself after a few engine start stop cycles. Usually in a couple of days. If the light is still on, the mechanic is either unethical or incompetent and sold you a gas cap that you didn't need. The very next thing that I would replace if I were you would be my mechanic. It could also be just as easily be a leaking O ring in a EVAP system line, it could be a loose fitting, it could be a damaged EVAP system line. It could be that the mechanic sold you the incorrect gas cap. Some of the better OBD 2 diagnostic scan tools have the ability to erase the trouble codes which reset the check engine light. The cheap scan tools used by the auto parts stores usually can not erase codes, just read them. What I would do if I were you. Take the car to a different reputable mechanic. Explain to them what has happened. See if they will erase the trouble code for you. If there is no problem, the light will stay out. If the check engine light comes back on, there is still a problem with the EVAP system. For now, you can safely drive the vehicle with this trouble code. This will not affect the way the engine runs in any way. This is a emissions issue. If there is actually a problem it means that you are venting gasoline vapors from the fuel tank. However, this should eventually be addressed.

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