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Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19450
Experience:  ASE Master Certification. GM World Class Certification
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Chevrolet Silverado 1500: On our 2002 Silverado, we had codes

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On our 2002 Silverado, we had codes PO300 and PO135. We changed plugs and wires and the drivers side oxygen sensor. Cleared codes and tried to get it smogged. It failed because the technician said although the light was off the long term memory still retained the code. Since then the light comes on with code co135 after 2 days after clearing.
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Which drivers side O2 sensor did you replace? Was it the front one or the rear one (behind the catalytic converter)?
Customer: replied 4 years ago.
We replace the inlet sensor
Thanks for the info. In the underhood fuse panel, check the O2 A fuse and see if it is blown.
Customer: replied 4 years ago.
The fuse is not blown.
There are two different types of O2 sensors on this truck (case grounded or non-case grounded). Do you know for certain that the correct type was installed?
Customer: replied 4 years ago.
We installed a Delco part. I am not sure of the grounding type.
Have you recently set the P0300 code or any codes other than the P0135?
Customer: replied 4 years ago.
no, the only code that comes up os the po135
Normally when this code sets it is either due to fuel control problems/misfires or is due to a faulty sensor. Since you no longer show any misfires, there are no lean or rich codes, the O2 heater circuit fuse is okay, and no faults on the other bank of the engine then it looks like you got a defective O2 sensor. I would suggest replacing the O2 sensor again, the part should be under warranty.

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