MAC Posted November 26, 2010 Report Share Posted November 26, 2010 Anyone with a 2005 STS with a V8 engine should be aware, if you haven't already received notice from GM, that the catalytic converters are prematurely breaking down and that GM will replace them free of charge. If the check engine light is on take it to a Cadillac dealership for diagnosis. If it involves one or both catalytic converters then schedule an appointment for replacement. If the dealership determines the problem is one or both catalytic converters, GM will replace them free of charge. This warranty has been extended by GM until 12 years or 200,000 miles, whichever comes first. I had both catalytic converters replaced. The job took all morning into the afternoon. Link to comment Share on other sites More sharing options...
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