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Good guess. See this https://www.audiownersclub.com/forums/topic/24906-alternator-failure-related-to-mild-hybrid-system/ Yours is a similar model but the technology will be the same.

Oh I have in the past. The manufacturer is notoriously tight lipped about the constituents of WD40. All one can get out of them is the MSDS (material safety data sheet) which reveals only that the solvent is similar to white spirit. https://sichdatonline.chemical-check.de/Dokumente/3275/EUF-0002_0012_27-02-2024_EN.pdf As a chemist in a past life I recognise that WD40 is a mixture of oil, white spirit and a powerful perfume to cover the solvent stink. I suspect it also contains drying agents to congeal the oil. Drying agents were commonly used at one time in oil based paints and varnishes. (I used to be involved in the manufacture of two such agents: cobalt siccatol and manganese siccatol so I know a little about them.)

I have to agree with Mark on this matter. WD40 is evil stuff that slowly congeals to a sticky muck that frequently makes the problem worse. If you get to it before it has completely dried you can free it by adding more WD40. It is like becoming addicted to a drug in that once you start using it you have to keep buying more. What a wonderful strategy to increase sales! Despite the manufacturers claims, WD40 is a poor lubricant. Bear in mind it was developed as a rust preventative because of its water displacement properties, (hence the WD in its name,) which require it to dry to a firm well adhered coating on steel. That's the last thing you want from a lubricant.

It might be the hydraulics that operate the clutch. At what point in the pedal travel does the clutch start to bite or grip? It should be about half way. If it bites close to the floor you have a problem with either the master or slave cylinder.

Hello Harry, Pretty sure there have been posts on this subject in the past, so well worth a forum search.

I replaced like for like Bosch S5 A08. I just changed serial number in VCDS to include the date I swapped it.