No there is no easy way to test a knock sensor. They are a piezo-electric sensor, which can only be tested by exciting them with a frequency sweep(and typically high voltage). Each differenty type of sensor has different frequency 'modes', which is steps of frequency at which they will resonate. Even knowing the exact modal frequencies of a piezo electric actuator/sensor, it is still very hard to distinguish mechanical stresses and fractures in the material.
Easy answer is, 'no', sorry. If it's bad enough that the ECU is telling you it's bad, then there's no point in diagnosing further. Definately check continuity on all wires from ECU to the engine room harness(for the sensor), before buying a new one.
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Tuesday, July 5th, 2011 AT 11:21 AM