Carbon Build Up Repair Options

Hi,

My '08 IS 250 with 54k miles will be 9 years old this week and thus my 9 year warranty extension for carbon build up repair will end.

I have had a few episodes of brief dropped idle speed and car shaking every few months but never a check engine light. My understanding is that Lexus won't repair it without a check engine light and code, correct?

Also, what are the repair options and cost if/when it gets worse besides a full rebuild that folks may have done.

I realize that may not cure the underlying engine issue but am wondering if keeping the car is worth the risk of very expensive repair.

Please help.

Thanks!



I didn't find the right solution from the Internet.



References:
  www.clublexus.com/forums/is-2nd-gen-2006-2013/839929-carbon-build-up-repair-options.html

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