What kind of O2's did you end up installing, Delco, Bosch, etc.? I recently installed a set of Bosch ones in my LT1 and now they are giving me :
1)PO133=CKT slow response (bank 1 sensor1)
2)PO153=CKT slow response (bank 2 sensor 1)
3)P1133=O2 sensor transit. time ratio (bank 1 sensor 1)
4)P1153=HO2S insufficient switching (bank 2 sensor 1)
Come to read afterwards on CZ28.com that Bosch sensors are hit or miss in terms of quality for LT1's, hopefully they are fine for your LS1, if that's what you got. Now I just gotta find some decently priced Delco O2's.
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