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I found this in my driveway under my car (2013 Subaru Legacy), so I can only assume it broke off. Any idea what it is??

enter image description here

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  • Welcome to Motor Vehicle Maintenance and Repair!
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jul 16, 2021 at 22:52

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It has broken off one of the suspension coil springs.

You need to get this fixed soon. The coil spring will not be seated properly anymore and the sharp end of the remaining coil spring could move and puncture the tyre, since they are usually located very close to the tyres.

enter image description here

This is just an example of a coil spring I got from here. The piece you have found is from one of the ends of the spring.

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  • Makes more sense with the pic. Nice job. +1
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jul 16, 2021 at 23:41
  • It looks like a significant steel making /wire drawing defect on the fractured end ( the angled end with the mostly silky gray surface.) But nut a good view for analysis.
    – blacksmith37
    Commented Jul 17, 2021 at 0:04
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    I agree with @HandyHowie that it is a broken coil spring I would also that the most common cause of spring failure is worn struts. It may be worth installing a pair of what is referred to as a loaded strut . That is a new strut with a spring mounted on it and in some cases the strut mount is also included.
    – mikes
    Commented Jul 17, 2021 at 0:32
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    SteveH - If this is indeed a piece of the spring off of your Legacy, I'd be looking at the front end. Reason being, the rear springs on your car are much tighter than the front ones. Check to see if either side is a bit lower than the other on level ground. @mikes has a good idea about replacement struts/springs.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jul 17, 2021 at 12:10

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