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If you own a modern Renault (particularly the Captur, Clio, or Megane), you might be familiar with the dreaded "Check Stop & Start" warning light. When scanned with a professional tool, this message often accompanies a specific, non-generic diagnostic trouble code: .
Due to the smart charge system, if the sensor fails, the alternator may run at maximum load, leading to a regulator fault.
The two-wire connector on the battery's negative terminal often suffers from corrosion or wire breaks. One wire provides 12V power, and the other (often pink/black) carries the LIN bus signal to the UPC.
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