[winther1]

Was driving home from Canterbury this weekend when I suddenly heard a loud clunk from under the car.
Turned out the undertray ripped, not sure how that happened. Doing about 70mph.
Hope it's an easy fix, but knowing bmw, they will probably find a way to charge a fortune
Have to make a journey tomorrow so considering cutting it off.

[MY340i]

Nothing some cable ties and duct tape can’t temporary fix

[fortythirtyfive]

The 8mm screws rust like f*ck. They'll have either taken a whack or just rusted off, once the carpet catches enough wind to push it back it'll drop down, I did it to mine after fitting a FMIC, hand threaded the screws and used a powered wrench to finish them all off except for the front which I forgot about lol.

You can get a clean 2nd hand under tray on eBay for like £50 (make sure it's genuine as there's lots of aftermarket solid plastic ones) then just grab some new 8mm screws and the clips which fit them and you're golden. Otherwise a dealer will want around £150 for the tray, £15-20 for screws and clips plus minimum labour for fitting which is usually an hour at most dealers.. so add another £100 just for tightening some screws.

[winther1]

Thanks for the advise. Went past my local garage and got it zip tied, so ok for now.
I haven't seen a complete undertray incl the plastic side bits on ebay. Will check with bmw

[Pond]

A garage with an inspection pit!
Don't see them very often anymore.

[winther1]

Originally Posted by Pond

A garage with an inspection pit!
Don't see them very often anymore.

It was too low to go on the lift

[fortythirtyfive]

Originally Posted by winther1

Thanks for the advise. Went past my local garage and got it zip tied, so ok for now.
I haven't seen a complete undertray incl the plastic side bits on ebay. Will check with bmw

Has it definitely damaged the side bits? I tried checking through the ETK and couldn't find them.. however from knowledge when I've had my front bumper off they've always come away with it, so maybe they're part of the bumper?

If it's just the metal clips for the screws which have ripped out you can replace those.

[winther1]

Originally Posted by fortythirtyfive

Has it definitely damaged the side bits? I tried checking through the ETK and couldn't find them.. however from knowledge when I've had my front bumper off they've always come away with it, so maybe they're part of the bumper?

If it's just the metal clips for the screws which have ripped out you can replace those.

Yes, he told me they had completely bent and also damaged part of the bumper

[phubeone]

How did you end up fixing this? I tried zip ties but my wife scraped the front of the car on one of those concrete curbs and now the tray is sitting lower than the bumper again, I pushed it back under but wanted to see if others found a solution for this other than replacing the bumper and tray.

[JLX.]

I would recommend replacing it or re-securing it correctly with the correct screws. I damaged the control motor for the steering rack on mine due to a damaged and exposed under tray. I was quoted to replace the entire steering rack as the motor can’t be replaced on its own, it was £2K+ job. Luckily I was able to fix the housing that had been smashed by stones coming up from the road and made it water tight again. It’s an awful location to have the control unit.

[winther1]

Originally Posted by phubeone

How did you end up fixing this? I tried zip ties but my wife scraped the front of the car on one of those concrete curbs and now the tray is sitting lower than the bumper again, I pushed it back under but wanted to see if others found a solution for this other than replacing the bumper and tray.

BMW ripped me off for the last service, but they threw in a new under tray, fitted for £30. Maybe guilt

[kitster]

I know that garage They do my MOT as SJ in Woolwich is a bit far. Friendly bunch.