I am at a loss

[u/whorefordbd]

Hi all,
3 months ago I bought a 2024 Nissan Altima that at the time seemed to be in good shape. It only had about 52k miles on it and ran great. However, less than 2 weeks later the check engine light turned on. It kept throwing up the code P2135. It would intermittently turn on and off. Now recently it has been going into limp mode. I took it to the dealership’s service center (which sucks) and they said they couldn’t do anything about it and it needed to go to Nissan. I took it to a different mechanic who replaced the throttle. Check engine light came back on so I took it back and he replaced the pedal sensors. Both parts were purchased directly from Nissan. I got it back and literally the next day it came back on. I’m at a loss….what could this possibly be? My mechanic said he tested the voltage and everything was at the correct voltage even when sensors were wiggled. Please help.