Having problems with your Subaru Legacy ?

2000 Subaru Legacy Outback Ltd Wagon F4-2.5 SOHC-AT. DTC P0325. I have tested on the old and a new knock sensor resistance and they both check the same.Voltage from the ECM is 4.8v.I clear the code,drive the car,but the code comes back. lou

Posted / edited by AnonymousUser on : 18-06-2018

Answers :

I had this problem with my '99 legacy GT.
The knock sensor would keep tripping the OBD.
I found the ECM required 5 cycles (cold and hot) to callibrate to the new sensor.
After the 5th clear - the CEL did not return.

Also, Inspect the wire and harness. any breakage (or if you cut/lengthened during swap) or wear will increase the resistance the ECM sees, and will report as an error.

Lastly, knock sensors will tend to report falsely under other conditions... such as if the vehicle has carbon buildup or other performance issues. Run a can of seafoam in your gastank and see if it clears the error if no problems are found with the wire/harness.

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