Underneath on tailpipe just before catylitic converter. Some models will have a second one between catylitic converter and muffler.
SOURCE: my chevy s10 failed emissions
Have your cat. converter checked out. I just had one of these for the same reason in my shop today.
SOURCE: replace oxygen sensor on 2003 chevy silverado truck
it's not hard to change, kinda like a sparkplug with a wire permenantly attached, if you go to O'reilly's or Autozone they will loan you a special socket to take it off and install the new one, Generally most cars have two one before and one after the catylitic converter, make sure which one the code is telling you is bad. Also a cheap fix, many wrecking yards don't charge but 5 to ten bucks for a used one as opposed to a new one for 60.00 to 100.00, If you don't mind going out and removing it, You take a chance one getting a bad one but, you can always take it back and get another one
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: need to find and replace oxygen sensor for 2003 chevy ventue
Need a 7/8 open end wrench or a o2 sensor socket. Located in exhaust pipe. The one closest to the engine is Bank 1 Sensor 1. The ones located downstream and known as "Sensor 2"
SOURCE: How many oxygen sensors on a 1996 Chevy Silverado
should be 4 two pre convertor and two post conv.if they are faulty there should be codes set for each one but as a rule of thumb they should be replaced every 80-100 thousand miles depending on driving conditions.
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