Good evening, Jörg,
The translation from your launch is amazing. Is that a device from Lauch Europe? I'm asking because I'm looking for another multi-brand tester.
Now, regarding your mistakes:
02261F specifically refers to the throttle position sensor. However, you can easily check if the values are plausible using an oscilloscope.
Your actual error message "Gas injection" corresponds to the error code: 0002F6, which refers to the injection ramp pressure. The inspection plan specifies that you should check the connections of each injector to the control unit and, ultimately, verify the supply voltage and the test values of the pressure regulator. In this case as well, an oscilloscope is a reliable tool. In total, the OEM inspection plan consists of 8 steps that need to be completed.
When was the fuel filter last changed

?
The error codes 047129 & 047195 are not OEM codes!!!
Best regards,
Michael.