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I've done nearly identical while diagnosing vanos; left unplugged and engine was really not happy.
Plugged back in and the problem I was having went away. Running for a cycle with unplugged reset something.
That works for O₂ sensor heaters also.
–awr–
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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