[Knock Sensor replacement]

Thats right... every super hero needs a trustworthy vehicle!

[head gasket vs. new engine on 99 outback]

Your lucky you got that many miles before this happened. My 99 only got 74,000 before the gaskets gave way. According to my machanic, the 96-99 2.5 were notorious for this problem because the factory installed gaskets did not have an etched surface (grabs the head better and prevents slippage).

Anyway, he said about 3,500 to 4,000 (prices may vary, this is Alaska after all) for a shortblock or the 2,000 for a rebuild. I went with the rebuild but that also included many extras like a new timing belt, head shaving, rollers, etc. that he found to be worn out.

Hope this helps.

[Knock Sensor replacement]

Thank you for the information. After I posted the original question, I did replace the sensor and the engine check light is now off. I did have to remove the air cleaner components. Getting the bolt down through the sensor was a bit tricky with all the other stuff in the way. In all about a half hours work.

Cheers!

[Knock Sensor replacement]

I figured this could have been the problem too, but I didn't know where to find the sensor. I will try this before replacing the sensor.

Thanks for the information!.

 

check the wiring to the sensor. a dirty connector/harness or exposed wire can cause the knock sensor code in the ECU as well.

[Knock Sensor replacement]

Thanks, this is just what I was looking for! Hope the 2.5 is similar.

 

 

I stole this from somewhere a while back. Credit to whoever put it together.

If you have EJ25 maybe its similar - (?)

 

 

 

Some quick notes and pictures on how to replace the knock sensor on a 1995 Subaru Legacy Outback (2.2 liter EJ22 engine).

Click images to enlarge.

 

The engine - not very clean!

 

New knock sensor.

 

Move the throttle body intake pipe out of the way.

 

Sensor location is on the driver's side rear close to the throttle body. Arrow points to it.

 

Remove the sensor with an extension and 12mm socket.

 

Old sensor removed.

 

Install the new sensor. Torque the bolt to 16ft-lbs.

 

Clear the engine code (if present) using some sort of OBD scan-tool.

[Knock Sensor replacement]

Hello all,

New to this board. I have a 99 Outback Legacy with 98,000 miles. My check engine light came on a while back and I went to the local repair shop to read the codes. They said the knock sensor is failing. So I ordered a new sensor and it is on the way. My cheapy shop manual has terrible instructions and an even worse photo of the sensor on the engine.

 

I was wondering if someone out there might have some helpful advice and possibly a detailed photo depicting the exact location of the sensor?

 

Thanks in advance.

 

Peter