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My silvia has been coming up with this error code and I don't know if it means that the knock sensor is not working? or that it is picking up a knock?anyone know?? I did a seach but

It means there's a problem with the knock sensor circuit. The sensor itself may have failed or become disconnected for some reason (eg cut wire or simply a connector has come off).

In the first instance you need to find the sensor and check all the wiring and connectors back to the ecu. If that all checks out, the next thing is to check the sensor itself. Usually replacing with a known good one is the best way to go.

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