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It won't really trigger a light to come on. If faults are checked their would be a low voltage system fault stored and there would be a notice in loss of power delivery. If someone wanted to test/check their DISA flaps there is a function in ISTA that can open and close the flaps.
When we attempted to make a pull we could see by the graph lines and by the air/fuel ratio that was something was off. We also just happened to have another 128i in that did the same thing, unfortunately.
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