OK, here is what I found off my MY02 manual:
1. Turn the key to position 2
2. Immediately press button(1) (left hand side nobe) twice within 1 second(recall the display)
3. Within 10 seconds, turn key to position 0
4. Press and hold the button (1), while turning key to position 2 again, continue to hold the button (1); after 10 seconds, a signal sounds, and the display should show 10,000 miles for about 10 seconds.
5. release the button.

Hope it would work for 98.