Golf TDI glow plug light whilst driving

Hi guys i have a problem with my vw golf 7.5 1.6 tdi 2019. Under high load (high rpm) the glow plug light comes on and then goes into limp mode, i did a diagnostic with the dealer and it came up with the code P164B00, they said it's the oil pressure switch, they changed it and it's the same problem, my friend did a diagnostic as i was driving and the error code is still the same but it shows the status as static whereas idle it would show it as intermittent.

I don't know if this is important to say but i had a little crack in the the front bumper and had to get that fixed and since then the ACC has stopped working