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Open the hood
under the intake manifold
The "knock sensors" for the Avalon 3.0 are facing the firewall on the engine block just below the cylinder head ,their are two knock sensors .
I was told at Autozone it is a Knock Sensor Circuit
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Knock sensor is attached to the engine side facing the firewall. It's not easy to reach.
engine bay
The manufacturer states throttle body and the intake manifold must be removed to access the knock sensor. The knock sensor is located on side of cylinder block.