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Originally Posted by 99 GTP
replaced both front and back O2 sensors and SES light came back on.....any suggestions, I reran the codes and keeps coming back second sensor. 99 GTP
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How many miles on your GTP? And is the CAT convertor the original? If you're getting a P0420 DTC error code its the rear 02 sensor picking up CAT convertor inefficiency.
Thrasher CAI, DHP v1.0 PCM,
3.25 SC pulley, CAIT GMAF, Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 TB,
TB spacer, MSD 8.5mm wires, Autolite 104s,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials