08 Sti Cel & VDC Light on Crusie and i drive flashing

Last couple of days I noticed my 08Sti has not been running quite right, and only noticeable is slow moving traffic when the RPM is below 2500rpm, it appears to stutter as you come on/off the throttle, once above this engine speed everything appears to be normal but would say the idle appears to be a litte rough

However today the dash decided to light up like a Christmas tree and now can’t select any of the I drive modes, so I assume it must be in limp home mode...

Since going into limp mode the rough idle has complety gone so has the stutter, is this because the ECU has shut down a faulty sensor or it has gone out of range so the readings are discarded by the ECU?

I'm fully aware of the ringland issues as my short motor was replaced 5000miles ago which was then remapped by one of the popular Guys on here, thankfully I don’t think the symptoms are the same (no oil loss yet)

So ringland issues aside what other things could it be?
Airflow meter, O2 sensor etc. etc.? Are there any other common faults on the hatch around the 25k mark?

If anyone got a code reader in the Worthing area that would be great!!