LEX-SV Posted March 20, 2014 Posted March 20, 2014 Some good explanations of the IS250 carbon buildup issue ^ here.
UCF3 Posted March 23, 2014 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.
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