Code P131, Active Knock Sensor Failure: Notes

WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

This test checks the knock sensor's ability to detect a knock. PCM adds an increasing level of spark that should cause detonation and sees if knock sensor detects knock. If knock is not detected, Code P131 will set.