Finally. After 3 years of abandonment by Chevrolet / GM, the problem is solved. It was a software "problem". A tuner has re-programmed the cold start (catalyst heating). It's a shame that Chevrolet / GM did not want to solve the problem while it was just a simple software adjustment. Unfortunately, that did cost me money (about $ 700), but I am happy that the problem has been solved finally after all these years. Again: a missed opportunity for Chevrolet / GM. I don't know if my next car will still be a Chevrolet / GM .....
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