Land Cruiser & LX470

Knock sensors No. 1 and 2 are located below intake manifold on the cylinder block. See Fig 1-27. Remove intake manifolds for access to knock sensor. See appropriate REMOVE/INSTALL/OVERHAUL article.
Using ohmmeter, check that no continuity exists between electrical terminal on knock sensor and body of knock sensor. Replace knock sensor if continuity exists.

Fig 1: Locating Knock Sensors (Avalon, Camry & Sienna)

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Fig 2: Locating Knock Sensors (Land Cruiser & LX470)

Fig 3: Locating Knock Sensors (Tacoma, T100 & 4Runner)