Engine undertray

[175gt]

Do manufacturers include in their service manuals/work lists, an instruction to leave one bolt missing from the engine undertray and associated trim bits and pieces each time a car is worked on? And failing that, if this would result in it falling off completely for example, break a bit off somewhere?

Or have I just been unlucky?

[Eighteeteewhy]

My under trays are held on with more cable ties than the original(crap) bolts/fasteners.

[Andyjc86]

The screws/bolts on these are prone to either snapping or stripping the thread, they're a joke sometimes!

The worst I had was a 57 plate TT, I think it was held on with 18 bolts!!!!!

[MartG]

As above - the bolts holding them on get all the crap off the road thrown at them, so tend to rust quickly and break when removed. The only car I haven't had this problem with was a Calibra Turbo, which had the undertrays held on with nylon bolts, not steel ones

[renrut]

And this is why the plastic rivet was invented. No rust, when the snap off rather than pull out just pop another in the hole. Cost <1p each and you can get the undertrays off and back on in seconds. I don't know why more manufacturers don't use them...