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    4. : What does the yellow warning light mean with the wrench on the Opel Astra?

What does the yellow warning light mean with the wrench on the Opel Astra?
Years 2015-2022

Answer

When making the diagnosis, it often appears that the yellow light with the key symbol (code 0704 and 0621) is linked to a spark plug problem. In many cases, however, it happens that even when the problem is solved, the light stays on due to a false contact.
Posted on: 15 November 2022 by ScegliAuto

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