I demand an explanation. Nissan Tiida

Greetings to all here.
Nissan Tiida 2012 Bencinero. It presents lack of unstable acceleration and idle. I made scanner and arrogates code P1122 Failure etc (Electronic Throttle Control) or sensor fault acceleration body). It was cleaned, installed, reset and the problem persists. I got another piece of another Nissan and the problem was fixed. So you buy the original Nissan piece ($ 1,100,000.- Approx cost in Chilean pesos). We install and the car is still equal except that check does not turn on and the scanner does not fail. We put the new piece in the other car and I am perfect. The strange thing is that if we draw the used piece from the other Nissan, OK is running, we put the new and fails.

If it were a wiring problem or another problem, the other way of the other Tiida would also fail, but OK works. The new piece works in the other perfect car.

Both cars are the same year and they are taxi. approx 210,000km.
As data the car that presents the failure was still slope. after the other side hahaha.
Will it be bad luck of the owner no more?

Good Walter, I ask .... You already calibrated the new butterfly with the pedal ??? You can find the online calibration method for each car in particular. It is a tedious process but with the Nissan X-Trail 2005 Turbo Diesel worked for me from movies. greetings!!

Thanks WTO electro for answering.
He has tried in the 2 ways, with Scanner and reprogram manually. The used piece of the other Tiida and without reset or reprogram is installed immediately OK. I'll keep trying.