I believe this is a sensor code and not an indicator of real knock
I would Check the shielding continuity and disconnect/ reconnect the harness at the connector near the transmission and clean the engine and ECU grounds and battery cables at both ends. If you have access to a lab scope there is a test in the FSM to check the output.
if you actually have pinging and drivability issues it may be from excessive oil consumption through the PCV system due to sludge in the valve cover baffle. Several threads on that. If you decide to change the knock sensors you might want to address that issue too. You may want to do combustion chamber cleaning
I would Check the shielding continuity and disconnect/ reconnect the harness at the connector near the transmission and clean the engine and ECU grounds and battery cables at both ends. If you have access to a lab scope there is a test in the FSM to check the output.
if you actually have pinging and drivability issues it may be from excessive oil consumption through the PCV system due to sludge in the valve cover baffle. Several threads on that. If you decide to change the knock sensors you might want to address that issue too. You may want to do combustion chamber cleaning