I just got my 2006 Prerunner V6 and took it to get emissions testing. The check engine light does not come on when the key is turned to "on". (Never thought I would actually want it to come on!)
My first thought was that there was a bad bulb, but I took out the instrument cluster and discovered there are no bulbs, just lights on the board. All other lights are coming on.
They found to OBD codes - both for the camshaft position sensor. I am going to replace that this weekend, but have no clue where to go for getting the check engine light back on