I'm no expert and I'm sure you will get all kinds of answers here...It may or may not be related to your last sentence since 455 is an EVAP code. May want to hook that line back up and start there...I have never heard of "B" codes. If you just go n clear codes you probably erased the freeze frame data (operating conditions) under which the codes were set, which will be helpful in diagnosing the actual issue.
You can take it to a reputable shop and have it diagnosed, doesn't mean you have to have them repair it.
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