try www.vauxsport.com.

Limp home mode normaly just issues a soft cut limiter at 4500rpm, so its not that. Could be an unmetered air leak.

Phase 0 doesnt exist afaik, ph1 is more boost and hardly worth bothering with, ph2 is more fuel pressure, more boost and an fmic.

If the EML is wored correctly you can read the codes thru that by shorting 2 pins, look for the guide to codes on topbuzz.