You got it on the AT Temp light. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Maint Required comes on at 150k IIRC and as they've mentioned is only a reminder that you should have your 150K mile checkup.

If the Check Engine light comes on then that means you've got a problem that the Engine Computer found and it's storing a code which gives you a hint at what might be wrong. Keep in mind this hint usually tells you that somethings failed or is no longer within spec but don't just replace that item. Find out what can cause it to go wrong or you may still have a problem and the same part will fail again because you didn't get down to the root cause.

HTH.

Oh, I was probably the CA guy you saw writing about the water setting off the AT Temp light. <img src="/forums/images/graemlins/cheers.gif" alt="" />