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Message: <blockquote data-quote="dadvan86" data-source="post: 29969" data-attributes="member: 11877"><p>Have a 2026 RS, 4200 miles. Since winter the knock sensor goes on and off. Already have had the sensor and wire replaced by dealer under warranty. Came back on the first drive after the dealership (couple days after due to holidays). Ran the fuel down to almost empty. Put 87 in it that is recommended, usually here 88 is cheaper, thought maybe bad gas was causing the issue. Been running fine until it got below freezing. Saw a post about cold start rough idle but I don't get that code and it seems to run fine and no noises. When the light comes on we lose power, like almost dangerously slow to accelerate and Poor gas mileage. I couldn't find anything similar online, hoping someone has had a similar issue with a 25 or 26 since it's the same motor.</p></blockquote><p></p>