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After contemplating for a long time, I finally bought myself an '08 F250, but it came with a check engine light. It also gets very erratic gas mileage (ranges from 13.5-17 under the same highway driving conditions) and I catch a whiff of smoke once in awhile sitting in traffic. It's throwing P2031, P2032, and P2084 which indicates a very high temp reading (low voltage). It sounds like this is just a bad EGT sensor at Bank 1 Sensor 2. Does anyone know where this is located? I believe it's the one between CAT and DPF, but I'm not sure. Any help is greatly appreciated.
The wiring looks alright. Plug is in and tight, but I didn't really look too closely for frays or rubs in the harness. I'd rather it be the $55 sensor than having to track down a shorted wire.