I have a 2009 Volvo v50 t5 r design. And I recently got a check engine light on for the first time. I checked under the car and my o2 sensor was dragging on the floor (see photos) and completely scraped the wires. I was looking for a replacement but I’m not sure which is the exact replacement could someone help? Do you know why it was hanging so low? Thanks

 

If this was my car, I'd simply cut the wires where they're damaged and splice them back together, and get on with my day. Done right, that will produce a good result. There's plenty of extra cable so that you should be able to cut / splice good wiring from each end together. Use lots of tape, or better, heat shrink tubing. It would take longer to get the car up on ramps / stands than it would to fix it.

Why is it loose? Because whoever worked on it last time was a bonehead, basically (sorry if that was you, BTW). ;-)