Hi,
The code indicates the knock sensor is bad on bank 2. This sensor is located on the back side of the engine, below the exhaust manifold, and closest to the firewall.
I attached the directions for replacing it below. Note that you will have to drain the engine coolant to replace this unless you are really fast. LOL
As far as testing, starting with pic 5 are the diagnostics. Before going to the trouble of testing everything, make sure the connector to it is in good condition and there is no damage to the wiring.
Let me know if this helps or if you have questions.
Take care,
Joe
See pics below.
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Wednesday, June 15th, 2022 AT 11:16 PM