2004 Chevrolet Silverado

Electrical problem
2004 Chevy Silverado V8 Two Wheel Drive Automatic 118, 00 miles

I have replaced both O2 sensors 9 months apart now the " knock sensor" is bad, according to the " idiot" light and tester from Advance Auto Parts. How is this possible or correctable? Truck still has original plugs, I've changed the oil regular. I did put flowmaster dual exhaust on the truck 3 years ago.
March 26, 2010.

Hello and thanks for donating

Sensors are not made to last the lifetime of vehicle, especially oxygen sensors. O2 sensors should actually be replaced on a regular basis just like any other routine maintenance part (i.E. Filters). The knock sensor failing at 118k miles isn't really bad, thats a lot of miles for one sensor to endure. 118k miles is also a lot for plugs, I would suggest replacing those soon as well.

Mar 26, 2010.
Thank you for your response. Now where is the knock sensor located on my truck/engine compartment?

Mar 31, 2010.
Not sure what your motor size is but their may be 2 knock sensors. They should both be right underneath the intake manifold

Mar 31, 2010.