kiwi dave
GT Reference
It will show up again 6000 miles after you reset it.
Are you sure it's after 6,000 miles, and not just a multiple of 6,000 miles? I say this because before I discovered the code, I had a dealer reset it and change the speedometer to kilometers at the same time. Less than 1000 km later, the spanner reappeared. It stayed there until I could do it myself.