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I haven't hit anything or done any strange off-roading, but my car has started making a very strange rattle from the back left when at low revs. It has the sound of a loose heat shield type of rattle, but I can't think of anything in that space that would do that.

  • loose tools or a tyre iron can do that... – Solar Mike Apr 14 '18 at 15:58
  • Heh. Yeah, I checked that :-) – Rory Alsop Apr 14 '18 at 16:03
  • It’s a good idea before grovelling under the car !! – Solar Mike Apr 14 '18 at 16:40
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It turns out the 06 WRX has its headlight self-leveller sensor at the left rear. Here's a picture of a Subaru Forester sensor and caliper (from the uksubaruownersclub.com site) - very similar setup. As the suspension moves, the caliper is pushed up or down, and the sensor reads the setting - which is translated to movement at the headlights so when you have a heavy load the headlights don't dazzle oncoming drivers.

enter image description here

But the calipers are rather more delicate than you might imagine, and mine has snapped. Not too unexpected for a 12 year old car.

The good thing is, I don't need to replace it, as I can adjust the headlights myself if I do have to carry a heavy load in the car.

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