Tom Wingo Posted December 19, 2006 Share Posted December 19, 2006 My new IS250 '07 (awd) is running too rich according to the dealer. Every ~600 miles I end up with my 'check engine' light and numerous other warnings showing up on my dash. The O2 sensor has triggered the CE light and the dealership simply changes the oil and resets everything. I'm told that that it's a firmware/software bug causing the fuel mixture to be too rich and that a fix might be coming in Feb. I'm guessing my oil is getting dirty (or loaded with fuel) and that's causing the O2 sensors to trigger. All these oil changes are getting annoying. Is anyone else having this problem? Given that it's a firmware problem I would expect other '07 models to be having this problem. I'm also amazed that it's going to take until Feb to fix the problem. Quote Link to comment Share on other sites More sharing options...
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