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Electrical gremlins can be the absolute devil to diagnose, a minor fault in one system can occasionally cause another system to malfunction and throw a code. Not uncommon now with highly interconnected electrical and computer systems on modern cars. I know it's frustrating as hell dealing with a persistent problem car, but as long as the dealer is being decent try to be understanding for the poor tech likely pulling his hair out trying to chase down the problem(and likely not getting paid for repeat work). If they're being jerks though stick it to em.
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