807 2.0 Automatic switches to emergency program with error code P0006

Hello I have an 807 2.0 gasoline with automatic (4-speed) BJ 2007 with about 46,000km. 1 year ago there were first problems with the automatic. during the ride he switched into the emergency program. The Peugeot workshop changed after reading the error memory a pressure sensor (on the invoice he has the number 252924). A few days after that the transmission turned back into the emergency program! Again into the workshop. This time the error memory allegedly showed on a pressure switch. I then first did not have I wanted to see if the error occurs again and is understandable! Nothing happened over 1 year. For 1 month then 3-4 times to the emergency program again!! Today I was the workshop. Error memory was read. Error code P0006 Pressure control difference / target value. Comment of the workshop. The error code shows again on the exchanged pressure sensor…. best I should change the whole gear so you don’t know what the cause is… it could be anything. So best to change gear (or better a new car I meant)! I should write to Peugeot and ask for a culant participation! P.S. Songs I did not let in the earlier diagnoses the prints of the error codes! So I don’t know what was displayed earlier! Does anyone have a tip?