Test a knock sensor yourself If you have a check engine light and a knock sensor code, the cause can be a bad knock sensor, or an issue with the knock sensor wiring or electrical connector. You can test the knock sensor yourself. Start by checking the condition of the wiring harness and electrical connector. Feel the wire for signs of an open, or rodent damage. Remove the connector from the sensor and check for corrosion. If the wiring looks good, move on to the bias voltage test Test the … Read More

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