You’re right, code P0325 refers to a bad knock sensor. It could result from damaged wiring, but testing the knock sensor is the best way to go here.
Engine knock happens when fuel burns unevenly or abnormally in your cylinders, resulting in an awful knocking or pinging sound. The knock sensor detects knock and warns you if there’s an issue.
This will involve accessing, but not removing, the knock sensor. In some vehicles this is easy, and in others it’s an arduous process. You’ll need a repair manual for your specific make, model, and year of vehicle and refer to it to find where to locate the knock sensor.
Once you’ve access to the knock sensor, you’ll use a multimeter to test continuity by connecting the positive end to the knock sensor and the negative end to a ground point. You should be seeing a number greater than 10 ohms. If you’re not, it’s a strong indicator the knock filter isn’t working correctly and should be replaced.
The price of a replacement knock sensor can vary wildly from one car to the next. Some will only cost $30 or $40, while others could cost hundreds of dollars. On average, you’re looking at spending around $75 to $150.
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