Arlington (IL) Toyota just did the 90K miles service on our 2002 Prius at 88.5K miles (early due to a check engine light that turned out to be for the issue for which we got an extended warranty letter from Toyota last summer.) In the process, they noticed and replaced a leaking water pump and its v-ribbed belt (at my expense.) Their summary of the 90K work done also had this "note: timing belt recommended every 90,000 miles." I have a question in to them as to whether that note means the timing belt was already replaced or that they now want to replace it as additional work. From elsewhere on this forum, it appears at least some newer models of the Prius have a timing chain rather than a timing belt, so what if anything does the above warning mean, and if it does mean anything, did replacing the water pump's v-ribbed belt resolve the potential issue? As for the warranty work, they cleaned the throttle plate, and said if the check engine light returns for the same issue, they would next replace the gas tank. Seems to have worked. The car was having trouble staying running beyond about 10 seconds when first started while very cold (below freezing), but no longer needs an extra start or two since their work.