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Presumably, he would ignite it and abandon it to minimise his losses. I believe it is the boost valve mechanism. My experience was similar - when I stopped operation, it would oscillate until I quickly pressed the throttle.

Did you promptly inform them about the light (i.e., before you departed from the dealership's premises)? As you said, the automobile was functioning when you activated it. I would be interested to know the number of recorded occurrences of the defect and if they were aware of the Check Engine Light being illuminated before returning the keys to you (which they would have been, by the way, if the light was on as soon as you started the vehicle). This topic is inundated with similar problems like yours, when a recall is initiated yet the situation worsens upon resolution. Halliwell Jones failed to correctly install my airbags during the recall, necessitating BMW's intervention to enforce a reinstallation.

It is unusual that both my E46 330d and my 640d had quite clean manifolds. Both vehicles had their EGR systems removed, however the 640d had this modification done at 79,000 miles and the condition of the manifold was inspected at 83,000 miles.