Hello all, I've had my Sport version 850I for about 4 months now and have been noticing the area around the O2 sensors in the exhaust will turn cherry red within a few minutes of riding. Idling doesn't seem to bring up to temp enough for the glow, but any riding for 5 min or more does. Slow or fast speed doesn't change things. Took it to the dealer after the first few weeks of noticing, and they said JD was aware and that it was normal. you can certainly smell it, not necessarily a burning smell, and was just curious if other on here had the same experience. I can only imagine how hard those sensors would be to remove when they finally needed replacement...
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