M111.955 loosing power when engine is warm (sorry writing in english)

Hello

I'm very sorry writing in English but Google translator is no good fron Finnish to Germany. I hope it's like this if not you can delete this thread.

I'm getting really desperate with my problem.

My car is loosing power when engine is warm. Engine light is on. When i clear all codes and start driving with cold engine it's working as it should be.

What i have done so far:

- changed MAF twice

- changed the camshaft position sensor + plug for the wire on the sensors end

- changed front lambda

- camshaft position controller (magnet)

- changed check valve (A 002 140 68 60)

- checked ECU for oil and there was none

- changed oil filter and oil

- changed fuel filter

- changed air filter

- purified purge valve (something to do ...