Front bumper falls down all the time

pics? is it the bumper, or the aero under cover?

 

It is a tough fix. You have the cover, but also the parts it attaches to.

A simple fix is drilling holes and using bailing wire to stitch it together.

 

The likely reason it's falling off (assuming it's the first black plastic underpanel, just aft of the painted bumper): it's not quite high enough off the ground to clear a lot of curbs and concrete wheel stops. The latter in particular are tough on it: you pull into a parallel parking spot, and that piece rides up and over the wheel stop. Then when you back the car out it snags, kinda like a barbed hook, and really abrades and tears itself.

You've got to get down there, remove it, see what's happening. It might be salveable, or not. There's a mix of metal screws and metal bolts. All require a 10 mm socket. The metal bolts screw into weld nuts. The metal screws are coarse thread, screw into nylon blocks pushed into the trailing edge of the painted bumper. There's also one plastic fastener, a somewhat odd one, at the front/centre.

Dutch Uncle time: you need to get involved, look it over carefully, understand what's going on. As long as you're not looking under there yourself, relying on "pros" to "repair" it with baling wire, it'll be an ongoing problem.

The good news: you can remove, repair and/or replace this without the need to raise the car. You do need to lie down in front, to see what you're doing. Throw down some sort of mat if you're parked on loose earth, and with a screw driver (for the plastic fastener) and a ratchet wrench (with extension and 10 mm socket) you can have that thing off in 5 minutes.

Any dealership parts department is the most direct route to replacement parts, albeit more pricey. Maybe if the panel itself has to be replaced: order that through amazon, and for fasteners use the dealership? Up to you.

The ongoing solution, avoid getting too deep into parking spots. It's a bit of a pain, and once in a while you forget, but just minimizing the times this happens will help. And if you've got minor abrading, 2-part epoxy, maybe with fiberglass mesh reinforcement, can sometimes restore it. I've done that a couple of times with ours now. It's a bit sorry looking, but holding together.