Knock Sensor Bad?

Sounds par for the course. I've replaced a few. They're on the block toward the back on the left side.

Phil,

I had to replace the knock sensor on my '96 Outback 2.5L at about 60k miles. Check Eng lite code indicated the sensor but no other symptoms. The dealer charged me $43.05 plus tax in June, 2003, for Part #

The sensor is located on the top left side behind the intake runners and is held down by one bolt that goes through the center of the sensor, which has a single wire coming from it.

EdP

I'm pretty sure the 'Knock' sensor you mention is actually a "NOx" sensor, which is part of the emissions control system. NOx stands for nitrogen oxides, which are a mix of greenhouse gases that contribute to ground level ozone, acid rain, smog, and can cause respiratory problems. For these reasons, our vehicles are subject to pretty strict emissions control standards for NOx and other tailpipe pollutants.

There are also knock sensors which feed the engine controller. AT least in one generation, they were actually fed by microphones listening for knock, and adjusting fuel/air mix dynamically in response.

-- Todd H.

Found a web page that talks about this in more detail:

-- Todd H.

Thanks guys.... THis time it is the knock sensor.... not the NOx sensor.... THe website sounds interesting. THe software too.... THanks....

Now I have to look into why I can't find a knock sensor online for the

This is a guess, but perhaps aftermarket hasn't caught up for the

Best Regards,

-- Todd H.

Try looking here:

I haven't followed all the links or read the thread carefully, but on some cars you can get spurious knock-sensor trouble codes. Did you try clearing it and seeing if it comes back?