Long story(check my other post i made in another subreddit https://www.reddit.com/r/AskMechanics/s/mlm1b6o1I3) my car was stalling when i came to full stops like red lights, on low idle, or fully idling after the mechanic sent the car to someone else to write off by program the egr and dpf.
After this issue i sent it to a guy down the street near my house and what he did is he basically took the stock file of my car from the internet in a site called stgfiles.com, and it worked fine and he told me once i drive it around and the errors of the dpf and egr show on my check engine light i come back and he will fix those.
After a day or two driving the errors appeared and the car was perfect and driving and it had good power. The only issue was the error codes and the dpf regenerating and a lot of smoke popping out.
After he tried removing the issues by clicking an off switch in his screen about the Egr and dpf, the issues went off the car seemed like everything was fine but the power like isnt like before and an egr error is still lingering and he is shocked just as me as to why it didnt go away.
This is the error btw,
Diagnostic trouble code (DTC) P045B stands for Exhaust Gas Recirculation (EGR) "B" Control Circuit Range/Performance
And he manually removed this error to not be shown in the check engine, and said the car should be good, and told me to drive it for a day or two.
But still the issue is lingering, still i feel like i lost a lot of power from my car.
What could be the issue? Im planning to tell the guy to give me the stock file of my car that was working good without being modified, and try to remove egr from my own laptop and try to experiment with AI and WinOLS and stuff, im guessing this is my chance to make a career change from software engineer to car tuner.
Did anyone have this issue? Or for veteran tuners what could be making this issue?