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A reset sometimes clears the faults. On my Sienna for some reason the VSC system warning light lit up while on the freeway. Having done nothing to the car nor have I used it on bad roads in the last 3 months, I simply disconnected the battery for a few minutes (or more precisely just the black wire), hooked it back up, and warning is cleared. Have driven it a few times and no issues so far.
On the other hand, my Cayenne first showed a "reduced engine power" light. And now it's a CEL. Car runs fine, unless you try to accelerate. Probably in limp mode and running on 4 cylinders. Since the battery is under the driver's seat, I wasn't going to bother, but will take it to an indy for diagnosis. The only two things I did were: 1) I tried to jump start the 911 with the Cayenne while forgetting to start the Cayenne first (stupid move) and 2) I put Techron complete fuel system cleaner a week ago. This might be more of a coincidence. But it could have exposed some part in the fuel system that is nearing its end of life, like the fuel pump.
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