Howdy, I have the same problem (2017 Impreza wagon w/ 115k), but in addition to the the check engine light I also have the "hill-hold" and "vehicle dynamics control" lights come on. Using my ODB2, I get an EGR problem code. My understanding of the flashing lights is that your cruise control is disabled due to the engine issue. However it is quite an annoyance because I have reset the engine codes just to reset my trip odometer. Plus I am not sure (with the multiple dash lights) if I truly have an EGR problem or if this is an electrical malfunction since the 3 lights come on and one or two turn off after a few hours. I would hate to mess with the EGR unit (having read of folks breaking bolts) until I'm convinced that the EGR actually is the problem.
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