Mine generally takes a few minutes but works quicker if I set it to manual by turning the fan speed up.

Sorry mines a L322

Always

I have all next week to ignore everything while chilling on holiday..............well everything but the missus

Sorry not falling for it this time........Oh bugger I just did.

You just had too didn't you, I've got far more important things to ignore without being reminded to ignore this as well 🤣

My issue was the HP pump and relief valve and yes it was a PITA to change. I refurbed mine which failed and then had to get a recon one so changed it twice.

There appears to be 2 sensors, HP and LP.

good point :)

But he doesn't know. It's been diagnosed as a pressure sensor issue

Yes he needs diags, my relatively cheap Foxwell does it

Surely plugging diags in to read pressures is the first and easiest step

You don't need the code you need to check what the pressures actually are

You need to check the fuel pressure to at least rule it out. Diags can read them.