Afternoon all,

I'm doing some trouble shooting on my 2011 A6, C6, 2.7tdi - CANA engine code.

On my diagnostics and that of an Audi independent the temperature before turbo is measuring 849°C, but there is no sensor before the turbo on the 2.7tdi (there is on the 3.0 tdi).

Can anyone point out if this temperature is irrelevant / red herring or is the reading is calculated from another sensor or a resistor somewhere?

I have replaced the temperature sensor on the EGR cooler to rule this out but no change there.

The reason for looking into this was over the last 2 years the car has had DPF regeneration issues, resulting in me having the DPF professionally cleaned at Home - DPF Clean Team, EGR cooler cleaned by myself - a real pain to remove, injectors removed and tested (all ok) as well as other unrelated exhaust temperature sensor failures.

Any advice greatly appreciated on where this temperature input comes. Thanks a lot.

To close this thread the temperature before turbo is a red herring - so the 849 degree is irrelevant.

My DPF issues were down to an air leak on the inlet side so unmetered air was being drawn in so the fueling was off as the MAF would not detect this additional air. Found by smoke testing the inlet.

After replacing all the gaskets in the vee, to solve oil/coolant leaks plus gasket / diaphragm on PCV the problem is solved for over 18 months now.

Great. Thanks Greg.