I have a 2000 dodge caravan and the check engine light just came on. I think I have the right code: 23. Then 55, which I was told was the end signal. I also did what I think was a control panel diagnoses; that said code 999, check 0, check 1, 2, and 3, but that was all. Can you tell me what that code (23) means? Is this an expensive repair? Is it save to drive? I am really stuck. Thank you.

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