LEX-SV Posted March 20, 2014 Share Posted March 20, 2014 Some good explanations of the IS250 carbon buildup issue ^ here. Quote Link to comment Share on other sites More sharing options...
UCF3 Posted March 23, 2014 Share Posted March 23, 2014 The misfire code would be the best way for the dealership to determine if you're a candidate for the CSP. Your complaint to the your service adviser should state you are seeing sudden drops in RPMs folllowed by a return to normal, especially when the motor is warm, or you're refilling your oil every 1000 miles, etc. Quote Link to comment Share on other sites More sharing options...
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