P1641 -неустранимая ошибка.Цепь форсунок-каскад управления форсункой неисправен.
Partner 2.0HDI RHY CID801.
Закономерность: если ошибка стирается PP2000 ,то машина заводится с пол-тычка, если ошибка не стирается то машину не заведешь!Ошибка чаще проявляется в сырую погоду.Если стерлась и завелась может проездить и неделю и месяц.Это мои личные наблюдения.
Еще нашел вот это:
P1641
For SID 801; Check the Piezo electric injectors. They complete the power stage for the ECU driver. If they are in question, they probably need replacement, even if their capacitance readings are Ok. In addition, this code maybe attributed to the physical driver stage in the ECU, therefore the ECU maybe at fault.
In a case that I had with this fault code, the solution was to replace both the ECU and the injectors.
A more recent event, found the problem was caused by a single injector wire shorting to ground. (When I say shorting, it was approximately 2 MOhms to ground, which was caused by a slightly chaffed wire surrounded by moisture).