I have a 99 V70 wagon. The ETM was just replaced at a volvo dealer. Now they say that the catalytic converter needs to be replaced as well. I have poured a lot of money into this car. Last year, a new timing belt, brakes front and back. And now this. Does a failing ETM lead to a failed catalytic converter? And if I do make these repairs, are there other issues that are related that might come up? The car has 185,000 miles on it. I'm wondering if its worth it. Could use some advice.