The maintenance minder in my 2006 Accord (4 cyl, 85,000 miles) came on with the B1 code since I was due for an oil change. A few days later the code changed to B13 meaning I also needed a transmission fluid drain and fill. One day later the code changed back to just B1 without me resetting anything.
Is it unusual for the code to disappear like that?
I am going to replace the transmission fluid when I do the oil change. Do people usually replace the filter, or is that not necessary?