I don't have a lot a experience working on cars but replacing the knock sensor seemed pretty straight forward and it was going fine. I removed the old one and clipped the new one on and was trying to line up the hole to screw it back down and I lost the bolt. It is somewhere in the engine bay and I will try to look for it again tomorrow if I can jack it up to get room. If I cant find it does anyone know what size bolt will work or does it have to a subaru specific bolt. 

 

2001 Subaru Forester 2.5  knock sensor

 

 

Thanks 

A flashlight and long magnetic pickup tool.  Those magnetic pick up tools are worth their weight in gold, i'd just put the money towards one of those and you'll be all the better for it.  very handy tool to have.

 

this kind is awesome:

http://www.autohausaz.com/search/product.aspx?partnumber=66500LISLE&utm_source=google&utm_medium=nonpaid&utm_campaign=froogleACC&utm_term=66500LISLE&gclid=CLrlteHw37gCFcue4AodcUUAkw

 

i have one of these and they suck:

http://www.toolplanet.com/product/MAGNETIC-PICK-UP-TOOL-BT004779?vfsku=BT004779&gpla=pla&gclid=CNXw_-3w37gCFcue4AodcUUAkw

 

If you need to replace the bolt, just get a bolt at the hardware store. that's a generic metric bolt. You need to match the:

Thread type which is M8x1.25  (where M8 is the diameter of the shank and 1.25 is the thread pitch).

 

except for a few very small M6 and obscure bolts all Subaru thread pitches are 1.25.  so you just need to know the diameter.

 

And make sure it's long enough.  Take the old sensor with you or measure it and get a bolt a half inch longer or one inch longer.  A couple washers wouldn't be a bad idea to take up any extra slack if it's too long.

 

The original head is 12mm but the replacement doesn't have to be the same head size as long as the threads are M8x1.25

 

Some auto parts stores even have charts like "If your head size was XYZ then the bolt size is ABC"...kind of thing. So knowing you used a 12mm socket could identify the diameter on a Subaru....but i'd consider that an emergency or last resort.

Edited August 2, 201312 yr by grossgary

I tried to magnetic pole and could not find it. Thanks for the info on the bolt size. If i cant find it tomorrow then I will go that route.

 

Thanks