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Q: P1449,P1420 and P1600.Had diagnostic done, they said no issues. lights still on? on 2003 Honda Civic Hybrid

I bought this car in March. IMA and Check Engine light was on. Had diagnostic done at Honda asap. They said the only issue was the 12v. So I replaced it. Tech said there wasnt any communication found with the IMA system. So they didnt know why the light was on. So they did a software update. Lights were off for about 100 or so miles. Then came back on. Then a lil more time goes by, it would turn back. For the last few months, the lights would come on and just go off. The times it came on, it was raining. Ive noticed the light recently came back on when it was humid and raining. It hasnt turned off then. And its been over a month. Im trying to sell it now. I went to Autozone and the codes they pulled are P1149, P1420 and P1600. Ive done some research about these codes online, But still dont know what to do.

Thank You in advance.
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If u havent sold the vehicle yet, let me share something with you. Sounds like Honda is still having the same IMA issues than when I first bought my civic hybrid in 2004. Same thing happened but in the heat of summer. I brought it in and they said that the heat will sometimes trigger that IMA to come on but not to worry. This is about a year or 2 after I bought it. They reset a code and off I went. A couple of days later , it goes off again . This time IMA battery will not charge. It took me 4 different times taking my civic hybrid in for them to finally realize that it was a faulty charging circuit in the IMA BATTERY SYSTEM. They replaced the battery and system for free even though the car was out of warranty
I have a 2003 Honda Hybrid with 65,000 miles and the dealer says the IMA battery needs to be replaced how can i get replaced out of warrenty
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