Those codes are very interesting. The 300 codes are related and "might" be caused by the last one. If the car is clean otherwise, suspension, electrical bits, tires, brakes, etc.,etc. It could be a deal. If this is the case, it might be worth a PPI. Realize that all of these things can add up to thousands of dollars in repairs, even if, like me, you wrench your own!
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!

Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?