If the Check Engine Light is flashing, don't drive the car.
What is your reference for this information: "My symptoms appear to align with codes P0654, P0655 and P0656 but I will wait for my decoder to be sure the indications are consistent with these trouble codes."
I checked on RennTech and didn't see those codes listed for an 03 Boxster.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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