I got the same code driving a few weeks ago - on a road trip of about 1000 miles. I had used 89 octane gas that morning (normally use only 87) - went to Autozone and found that code. At next gas fill up on the way I went to Texaco and put some 87 octane in, pulled the battery cable for 5 minutes and 1000 miles later no light has come back on. Hoping it wasn't a cat for me but just a fluke. What did you end up finding out about your Highlander? Was it a cat? O2 sensor? Fluke? Any help would be appreciated!
My car has been well maintained as well - synthetic oil only, always done fluids etc. On time with dealer only parts and it's garage kept, in Florida.
Tuesday, June 29th, 2010 AT 4:00 PM