SOURCE: 2003 Honda Oddyssey - PO325 Knock Sensor
If The engine in your van is a 3.5L, the knock sensor is under the upper intake manifold. This has to be removed in order to access the sensor on top of the engine block. The job requires an upper intake gasket set and about 1.5 hours to do; if you are handy with tools. For those who aren't; better off leaving this one to the professionals.
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