Sensor, Knock: Description
 Courtesy of CHRYSLER GROUP, LLC
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NOTE:
The forward knock sensor (1) is known to the Powertrain Control Module (PCM) as Knock Sensor 1. The rear knock sensor (3) is known to the PCM as Knock Sensor 2.
The 3.6L engine uses two knock sensors (1, 3) and are bolted to the cylinder block under the intake manifold.