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Thanks for the comments. Follow-up: After seeing a post on the 986 Forum called "Knock Sensor Help" by Miles1, today I removed the front engine cover and used a flashlight to inspect the wires/harness from the knock sensor behind the alternator (see link/image below). Low and behold, I have the same issue - the wire at the connector attached to the knock sensor was frayed/broken. No telling hby kw986s - Main Forum
This is my first post... Last month I got a CEL on my 2002 Boxster S. I ran an OBD-II diagnostic scan and got two fault codes: - P0453, fuel tank pressure sensor - P0327, knock sensor 1 Since my battery was almost five years old and needed to be replaced, I removed the battery and tray to access the fuel tank pressure sensor and discovered two of the three wires to it had become frayed and brby kw986s - Main Forum