FWIW, I've replaced more than one on my former VWs, same type of Bosch part. All I did was carefully remove the connector to it (gently open the release with a screwdriver) and unscrew the whole thing from the intake pipe. The hex screws are part of the assy and you dont remove those, ust remove the entire part from the intake (phillips). Shouldnt need to rset anything. I'm planning to replace mine soon as well due to similar issues.
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former: 83 300D, 97 C230, 93 400E
current: 08 C300 Luxury , 92 500SL
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