-The underbody panels are coming off!

i wonder why they are falling off

 

The black UV stabilized nylon 6-6 push to lock rivets that hold the panels to the steel sheet metal don't last forever. Vibration, tensional amd shear forces and even UV light reflected off the pavement eventually destroy them.

Over the years and during my 6 months oil change interval, I examine the panels for missing nylon rivets and replace missing or broken ones.

Most all are metric 7mm, the Toyota standard.

Recently, I purchased these off of Amazon and after 10 years, replaced them ALL.

Ziruiautopart 100 Pieces Pin in 7mm Hole Compatible for Toyota 9046710183 Plastic Rivets Car Clips Fastener Push Clips Retainer for Cars for Scion Lexus

 

I just dropped mine down each with 36 lb of driveway gravel in them they were still hanging properly actually looks like people scrape them so I removed them just left them off My car doesn't see any of that kind of activity yeah unsafe as it may be

 

I have none under me either. Has not been a problem at all including gas mileage which averages year round (on the dash) at about 53. I understand this can be off as much as 5% but that still leaves me at about 50. My salvage title 2015 had 24k when I bought it in 2017, now has just tripped 86k...they did not replace the "skid pans" when they did the rebuild and with my type driving I saw no reason to add them back. I believe they are more for "protection" from road debris since the car sits so low, than for better gas mileage...just my opinion though.