Glow plug light & limp mode?

[delaxm]

I have a 2017 seat Leon fr 2.0TDI 184 and have started to have issues with the car going limp & flashing glow plug light, no codes recorded or when in limp mode (driving with code reader plugged in)
Seems to do it mainly under full throttle & before it's fully warmed up but has done when warm.
I had the garage fit a new fuel filter & have a look at it when mot'ed last but they couldn't get it to do it.
Any ideas ?

 

[cairus]

Which diagnostic device is in use?

 

[delaxm]

It's a cheap Foseal Wired Car OBD2 Scanner borrowed from a mate.

https://www.amazon.co.uk/Foseal-Reader-Scanner-Display-Screen/dp/B07RQCP5PY?th=1

 

[cairus]

Use something sensible like VCP or VCDS or obd11

 

[Cainy1989]

Get a proper code reader and it would mean less guess work, when I had the same symptoms as yours with my 2.0 TDI it was due to a split boost pipe, but proper codes will tell you all you need to know for the most part, theyre not that expensive be cheaper than paying a garage anyway