Knock Sensor

Knock sensor(s) are located on the cylinder block. See Fig 1 and Fig 2. Remove knock sensor from cylinder block before testing. See REMOVE/INSTALL/OVERHAUL article.
Using ohmmeter, check that no continuity exists between electrical terminal of knock sensor and body of knock sensor. Replace knock sensor if continuity exists.

Fig 1: Identifying Knock Sensors (1.8L)

Fig 2: Identifying Knock Sensors (2.2L)