I had the “diesel” noise late autumn/early spring - extremely annoying sound. Proved to be the servopump and the generator making noises at idle. I did not do the replacements myself but according to my independent technician it was not a straightforward job.
Mine is 2003 S with 190.000 km on the clock - now spinning like a cat again.
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2003 Boxster S
Seal Grey
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