The first issue was the shop told you it was the cam shaft sensor. Was that issue been resolved?
Now the issue is headlight flickers and the shop charged you $250 for diagnostics but cannot tell you what the problem is. Is that what you're asking. FYI - the issue doesn't show up in the machine......in your own words because the issue is not monitored by the machine. Your mechanic should know that. Sounds to me like a loose connection, a short or alternator problem.
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