So my wife forgot to tighten the gas cap and got a message on her dashboard. I don’t remember the exact message but it’s something like “something fuel cap?” I don’t recall but I told her to check the gas cap and see if it’s tight. She stopped the engine, tighened it, then started the car again. That message on the dashboard is gone but now the check engine light is on. I figured the check engine light being on is related to the recent gas cap loose issue.

I read on here that the light will turn off after a few cycles. Well it’s been 4-5 days now and the light is still on. Took my car to autozone and their code reader reported p0442, p0402, and p057b.

Can anyone help?

 

2 of those are shown by a web search as not to do with the gas cap so maybe there are actual faults...

 

do they go away after some time?

 

Only if not current.

 

P0402 is the gas cap, once corrected it should go away on its own.
P057b relates to the brake pedal position, and is likely due to a faulty brake light switch, it won't go away, even if fixed until commanded to by a dealer level scanner after being repaired. But it doesn't turn on the check engine light.
P0442 Relates to the EGR valve allowing too much flow, it will turn it's fault off after repair.