Copied from another site:

On the Club Lexus forum, this has been a big discussion since Lexus announced that they would be replacing piston rings basically rebuilding the engine on all Lexus IS 250 models.


This is directly from the letter:
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Intermittently runs rough after coming to a stop with the engine at operating temperature.
Intermittently runs rough with engine misfires present after a cold soak startup.

If this condition occurs one or more of the Diagnostic Trouble Codes* (DTC's) P0300, P0301, P0302, P0303, P304, P305, and/or P0306 may be recorded
*The check engine light may illuminate for reasons unrelated to this condition.
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Read more: http://www.city-data.com/forum/autom...#ixzz2mQtf3Bit


http://www.clublexus.com/forums/is-s...ld-up-csp.html