(CEL) Codes - 986 Forum - for Porsche Boxster & Cayman Owners
Quote:
P0300 Misfire Damaging to Catalytic Converter
P0303 Misfire, Cylinder 3, Damaging to Catalytic Converter
P0306 Misfire, Cylinder 6, Damaging to Catalytic Converter
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Based off the codes you provided it sounds like you need to address cylinder 3 and 6. What condition are the coil packs and
spark plug connectors in? They may be fine under normal driving, but unable to cope with heavy driving. it may be time for a new set.
-Matt