Throttle body position sensor

Hi all, I have a Toyota chr 2 weeks ago car went into limp mode randomly, whilst driving engine management sign came up along with a message on dash saying (anti crash malfunction turned off) called the AA and fault code P0121 which comes up as the throttle body position sensor I have changed both throttle body and position sensor but the problem still persists when I clear the fault codes it runs perfectly normal then kicks in again pretty much straight away and goes back into limp mode where it only runs on the Battery and not petrol. Has this happened to anyone before or even any suggestions would be appreciated.  Thanks

To me seems like the fault was not in your throttle body or position sensor, these barely goes wrong on Toyota cars. You may look an issue along the wiring, or accelerator pedal. 
Do good research on Toyota P0121 what could  it be and how to diagnose. 
Don’t buy new parts before 100% sure you need them. 
Good luck 

Another thing that might upset your car is low 12v Battery.
This can cause problems along fuel + air systems, power steering, egr, brake system, safety system, pre collision monitoring etc , anything really as all those are running on 12v. 

Thanks mate it went into a specialist today and they checked all fuses and what not but can’t find anything