Well I have 2 G40 engine looms, both are identical and 1 came out of a running car. im using a G40 ec loom and a stock 1.0 engine loom. The car i took this engine out of had the yellow plug i mentioned and that was a 1.0, mine doesent however and he wired it the same way as me.
The plug I'm missing is on the polo loom, not the G40 loom. Its ment to be on a clip in the scuttle tray next to the fog light plug, ivew moved all my loom inside but I 100 percent don't have the yellow half of the plug I'm ment too.