I've been following the threads on wiring open the by pass valve. Did it last week and it triggered the check engine light. Just got the car back from Shelton today (for new airbag cover) and the tech removed the code. SD-1 Exhaust Bypass Temp Light due to by pass valve being wired open. Question: When you wire open the by pass are you elevating or reducing the exhaust temp? I think it lowers it, and the OBD is looking for a higher temp. Does anyone know for certain?