Service Manual / Knock Sensor

One more thing:

Amazingly, there's absolutely no mention of the location or how to replace the knock sensor in the official 95 Subaru Impreza service manual or supplements.

Generally when a code for the knock sensor shows up, you should replace the sensor. Get it from Subaru, not aftermarket. It's not very expensive.

The knock sensor looks like a 1" dia. steel "O" with an electrical connector on one side. A 10mm-head bolt goes thru the center of the "O" and attaches it to the block.

If your 99 impreza is similar to my 95, then the knock sensor is located on the driver's side of the engine, if you look down between the arms of the intake manifold on the back end. Use a flashlight and you'll see a round thing with a bolt going down thru it and a wire coming off the back side. The bolt will be tight, but shouldn't require more than 20-25 ft-lbs torque to remove. If it seems stuck, get someone with an impact wrench to loosen it, don't break off the bolt head, and use a 6-point socket with an extension to get at it. Disconnect the wire after removing it.

Bob

Thanks, Bob, I appreciate the response.... Interesting that it's not in the manual!

Dan D '99 Impreza RS2.5 (son's) Central NJ USA

Bob, is this it?

Dan D '99 Impreza RS2.5 (son's) Central NJ USA

Yup, that's it!

I found a little more info on some other sites. Going to try and pic up the part today and replace it tomorrow, hopefully that will fix the P0325, and then we can work on the P0446!!

Dan D '99 Impreza RS2.5 (son's) Central NJ USA

Dan, Did replacing it fix the problem. There are lot's of interesting email threads here and it is nice to know if they have a happy ending.

Geoff

The rule of thumb at our shop, if it's a knock sensor code, its a knock sensor.

Yup, I replaced one on 2000 Impreza RS according to the DTC. cost ~20.00 from eBay.