I have a 07 IS250, and have been getting the P0302 errors. I took it into the dealership and they mentioned TSB #2804 (which mentions a "Top Engine Clean"). Unfortunately I'm out of warranty so I had to pay $700+ for this to be performed (along with a $150 diagnostics fee).
I mentioned WAB2068 (Extended warranty for this issue), but they said I had to do the "Top Engine Clean" before they would warranty any of the work.
Does this sound right? If I had been in warranty, then the "Top Engine Clean" would have been included, but since I'm not, I have to (essentially) pay to help them diagnose this issue. Since I don't use my car that much (< 80,000k) it seems I may not see these errors again until after the 9 year warranty is up!
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