If it is an P1128, that is an Oxygen sensor on bank 1.
I would clean the MAF first, and if it is still the original one, it might be time for a new one. I kept getting CEL's for the O2 sensors when I first got my 2000 S, but they checked out OK on the PS2 analyzer. The CEL'S went away after the new MAF went in. Haven't had a CEL for over 18 months now (knock on wood and everything else).
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2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap, Coolant tank
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