Exhaust temp sensor 1

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Hi guys. Have a dpf issue. Limp mode. Eml on and glow plug flashing. On my missus exeo (b7 but with CAGA 2.0 cr tdi) think it’s a b8 engine but for the sake of this thread it should be the same as a b7 albeit part numbers may differ.

Have hooked the car up and sensor 1 showing 19c where 2 and 3 are running temps over 100c. Does this look like sensor 1 is at fault? I guess this is the turbo mounted 1. If so does anyone know if all temps sensors are the same and the best way to get access?
 

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