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I am a little surprised this answer is taking so long. I thought u had experienced Mercedes personnel on ur list?
I would wait a little longer.
Thanks for the reply. I still have just a clarification. In the diagram, what is indicated is that Part B4/5 is faulty. From your reply, it seems Part B4/5 is sold along with Part 52.
But what I would like to clarify is this: I assume that Part B4/5 is the one u can remove to reseal if there is a leak. So then, why cant I just go to a used car lot and simply get another Part B4/5 and replace instead of replacing Part 52?
I am attaching a picture of my system. I have confirmed there are no leaks. I will inspect the wiring in the mean time
Finally, can I get the part number for the B4/5 sensor just in case I need to search for it?