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The burping procedure will not start without a batter charger hooked up in the engine bay. At least that was my experience.
For me, when I had low coolant in the turbo lines I got the fault but no lights or limp mode from it.
Have you driven it since the vanos fix? Clear your codes and start fresh and see what happens. Def get carly to help with codes. Autozone ones won't do anything for you. You can also plot things to see what's going on with the tubos.
I'm not sure if your turbo issues will be solved by the pump unless it has a hard shutoff when over heating.
I would bank on the plugs being badly gapped. It's an hour long affair to check but it's worth it.
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