Another 'what does this plug do'

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Author Message   Rob. Smith New User Username: ro80rob Post Number: 4 Registered: 8-2007 Posted on Tuesday, 06 May, 2008 - 07:46:    I have a spare/extra plug by my airflow meter. There doesn't seem to be any reason for having it. I have included a photo of it below. However, in my BOSCH Jetronic book, it talks about the diagnostic plug being located adjacent to the airflow meter. The RR manual mentions 1 only. Is that/could that be what it is?. My car does not have the push button in the fuse panel. Being an 89 Turbo R, it is just before the active ride came in. I have the twin distributor. I also have two MAP (Manifold absolute pressure) sensors located one above the other by the electric cruise control actuator. I don't know why I have two? Any ideas?? Cheers... Rob.