The dealership found two things. Actually a third problem arose since my last post. The car was overheating and losing coolant.
The dealership found that the PRV (?) Valve on the side of the airbox was disconnected. It normally sucks clean air from the airbox and apparently all would have operated normally, until in got against another soft rubber hose and the vacuum attached it to that hose. That's apparently when I got my lights and codes.
The other problem was that the thermostat was installed incorrectly, positioned so that the bypass was in the wrong location.
Both of these problems were the result of a timing belt/water pump change several months earlier by a garage other than the Lexus dealership.
Friday, June 4th, 2010 AT 8:29 AM