2.0 SE avant with error code P0234

[Sullydog]

Hi

need some pointers please.

My son has just bought a 2008 Sportback with 88k miles and decent service history.

Driving home sunday night on M25 near St Albans  car was running perfectly ok

Then lost power and went to Limp mode

Took it to local garage who scanned it, and it came up with P0234 Turbo Overboost.

They reset error code and road tested car and its running fine again.

However i guess it will pop up again shortly.

Im guessing that someone out there will recognise issues and hopefully be willing to offer some guidance 

all suggestions welcomed 

Thanks 

[WPAWS]

found this https://www.yourmechanic.com/article/p0234-obd-ii-trouble-code-engine-overboost-condition-by-jay-safford

[Sullydog]

Been offline for a while

Many thanks Paul