Hi Everyone, I have a 2005 A6 C6 2.0 TDI and the car will not come out of economy mode, I left it into a local place to be regassed and when they gassed it they said it still did not work and could not be repaired so they took all of the gas out again. When I got the car back and read the codes I got the following fault

Trouble codes:
00256 - Sensor for refrigerant pressure/temperature Lower limit not reached
static
Frequency counter: 1
Measurements:
1.3 °v.OT
Mileage: 119249 km
Driving cycle: 103
Date: 2017-04-25 19:58:38
Priority: 3
01854 - Right front heated seat Open circuit
Intermittent

This was not there before I left it into them which I found odd, after looking online lots of people reported this sensor being faulty so I ordered one up and replaced it but it looked slightly different although seemed to fit OK but the fault is still there, does anyone have any ideas what to look at next, does the car just need regassed again? I dont want to have to pay for this if there is still something faulty.

Regards
David