Took my car for service in December 2016, one of my concern was the D flashing and the car losing power and was informed that the car needed a software update, two days after service it happened again and I took it back and again they ran some test but could not find anything wrong therefore software was updated again. the flashing of D persisted on the 22 the same happened. I switched off and on again but the catalyc converter light came on, I drove home the next morning it was off. This morning the light was on again, what does this mean and what damage is it going to cause. Please help
My car has 1250000 miles.
My car has an automatic transmission.
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