I have thrown a bad anti-knock sensor code in the computer, and the part cost $117. This is painful, and I have sensed in past threads that this is not an important sensor. Is it possible that the sensor is still good, but maybe I can run a higher octane fuel to reduce the knocking and have the sensor reset? I had a local auto parts store clear the code, but within 10 minutes of driving, it came back. What should I do?

Thanks for any advise that you can provide!

Here is info that I think will be helpful for you:
http://f1.grp.yahoofs.com/v1/cMupR7nrbxFTRFsEHU26eVfbkwgMtY8L6KR1_sgtV4sucApZHe pGug_UVAeW6HqpLoFeplZZHJqa1BOHjcWdv_0czEgdLQr9LcY/All%20about%20Knock%20Sensors.pdf

Any other codes??
WHen was last tune-up??
Like you stated the knock sensor rarely fails, usually another code is set with it.
Check oxygen sensors
Clean MAF Sensor

Tempfixit, thanks for the reply! There was another code, but it was for a sensor that this particular auto parts store did not carry. I will have the codes reread and see if anything else is thrown.

This van has 108,000 miles, and I replaced timing belt, plugs, cap and rotor at 103,000. I didn't replace wires.

The link you posted doesn't work, I even tried cutting and pasting.

Thanks again for the reply!

Always remember that a code does not mean that a sensor is bad, it is a intication as where you start diagnosing.