SOURCE: 2005 Chevy Silverado O2 sensor
I 1st need to know the codes, the O2 heaters are fused, but without the codes don't know, check the fuse box for the O2 heater fuse, if it is not blown I will try to make out what is wrong from the codes
SOURCE: knock sensor on 2001 chevy silverado
on the 4.3l version the knock sensor is on the back left side of the engine right by the bell housing. on the bigger engines they are below the intake manifold in the engine valley
SOURCE: Where is the knock sensor 2 (bank 2) located on a
I don't have a diagram but they are under your intake manifold. It's not to bad of a job. You don't have to remove the fuel rails or the injectors, they can come up with the intake. The #2 knock sensor is the one in the rear. I will suggest getting both of them and also the harness and do it all while you have it apart. I believe you will find that water has gotten down in the hole where the knock sensors are located. Make sure to clean it out very good with compressed air before you install your new knock sensors.
SOURCE: P0420 code changed o2 sensors check egine light
if the sensor didn't fix it check the wiring to make sure it's not broken anywhere...Also if you bought the sensor at a large parts outlet it could be defective...not likely but possible...
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