Optima & Magentis (Canadian) (2.4L)

Knock sensor is located on left side of engine block. Disconnect 2-pin harness connector from sensor. At component side connector measure resistance between terminals No. 1 and 2. See Figure. Resistance should be 4.50-5.50 k/ohms at 68°F (20°C). If resistance is not as specified, replace Knock sensor.