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I had the P0446 code. Replacing the purge valve and the charcoal canister in the fuel system eventually solved the problem.
The other two codes are:
P1128 Oxygen Sensing Adaptation Area 2 (Cylinders 1 - 3) - Rich Threshold
P1130 Oxygen Sensing Adaptation Area 2 (Cylinders 4 - 6) - Rich Threshold
Since they've replaced the MAF, it's possible you need to replace the two O2 sensors before the catalytic converters. I'm not an expert on this though.
I'm wondering why your dealer can't figure this out.
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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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