Glad you have got the car back and BHM have done what they excel at.

Two observations I have never owned a code reader as over 43 years I have not seen the need as faults thus far for me have been logic deduction, now I'm happy to admit I may have been lucky.

The other is that after a lifetime of fault finding and rectification for a living in the commercial electronics field and found on occasion too much information can steer you away from the initial cause, it is a very fine line.

I think your explanation and process will be a great help to others with a GDI though.

I run my cars most days excepting salty conditions and I think regular running makes a huge difference to the wellbeing of the cars and me observed over 43 years and not a battery charger in sight....

2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev