Am thinking about replacing the upstream o2 sensor on my Vulcan to see if it helps my mileage, is that the one i want to replace and how easy it to change?
I have no codes showing as of now was just thinking with the 126k miles on the stock ones it would be something due for a maintenance item, but if its still good i will leave it.
How sure is it that the codes will show when the o2 sens is bad ? Is it possible to have a failing sensor with no code?
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