I recently had he Check Engine Light come on. Since it is at the tail end of the extended warranty (I purchased before finding out about Club Lexus), I took it to the local Lexus dealer for repair. I made a point of asking for the CEL code, for the benefit of those on the forum. It's listed on the invoice as P1150, open in the heater circuit, B2 S1 O2 (bank 2, sensor 1 02) sensor. The cost was $206.86 for part #89467-48011 and $112 for labor.