August 2, 200421 yr My Check Engine Light illuminated a few days ago; I scaned the system and got a #325 code (Knock Sensor Input High). I just replaced knock sensor with an new OEM part about 6-months ago - does anyone know what would cause repeated knock sensor failure? Additionally, does anyone know the resistance (in ohms) the sensor should have. The vehicle is a 1999 Outback with a 2.5 engine. Thanks in advance for any help.
August 2, 200421 yr Your problem may be with the connector or the sensor wire rather than the sensor. I replaced the sensor in my '88 GL-10 with a 560 kohm (560,000) resistor until I could replace my bad sensor and that turned the ECU light off. I suspect that may work for you also.
August 2, 200421 yr Phillip Did you clean off the block surface with some sand paper before installing the new sensor and torque the bolt to 20 lbs/ft. The sensor uses the block as it ground circuit and if there is any corrosion you may get an incorrect reading SEA#3
August 2, 200421 yr Author The block was new when I replaced the knock sensor; I'll pull it off and clean the surface. Thanks for the tip! PhillipDid you clean off the block surface with some sand paper before installing the new sensor and torque the bolt to 20 lbs/ft. The sensor uses the block as it ground circuit and if there is any corrosion you may get an incorrect reading SEA#3
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