Found the probable cause of an undercarriage rattle - Can someone advise?

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BrokenVisage

Lifer
Jan 29, 2005
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I own a 2011 Mazda3 hatchback, bought it new back in November of 2010 and it's been pretty steady so far. Here's the reason I'm posting..

Was driving back from a restaurant in a wooded area I was not familiar with and as fate would have it I ended up not being able to react fast enough to what I believe was a mangled tire from a truck stretched across the road and ended up having to drive over it at about 40-50 mph.

It was bumpy and loud and my heart was racing but my car seemed to come out of it without any cosmetic damage or weird feelings/sounds while driving afterwards... until yesterday, when I started to hear a faint rattle that seemed to be right under my seat.

I don't have any jacks and I can't really take it to the dealership because I need it for a business trip tomorrow, but I seem to have located the cause of the rattle and snapped some pictures of what I found.

There's a strangely shaped piece of black plastic being held to the undercarriage by 2 white nuts on each side of the car. The one on the driver's side must have lost the white nut that's closer to the middle of the car when I went over the tire a few days ago, and coupled with the other nut being loose I believed this to be the cause of my rattling. I realigned the plastic and tightened the one nut to try and eliminate the rattle and so far I can't hear it so I think it's fixed, however I'm not sure what this plastic thing is, if it's important, and if I'll be OK taking the car on my trip tomorrow.

Can someone please look at the pictures, assess my story and advise me on my situation and what I should do next if anything.

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W4NGe.jpg
 

NutBucket

Lifer
Aug 30, 2000
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Or maybe its a splash guard of some sort? Either way, I wouldn't let it stop you from driving the car.
 

BrokenVisage

Lifer
Jan 29, 2005
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Thanks, to be safe I may bring it into my dealership on Friday, at the very least to get that nut replaced.
 
Sep 7, 2009
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It looks like a cover for a rubber plug that allows access to the cabin. It's probably safe to drive on the trip, just make sure nothing else is hanging down.


As an aside, it looks like your heat shields are bent all to hell. The dealer will probably recommend you to replace those.
 

bruceb

Diamond Member
Aug 20, 2004
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I ran over a truck tire tread once on RT46 .. it flipped up, swatted the front bumper cover, which then needed a full repaint (paint got all cracked). Alignment was also messed up after it went under the car. Luckily, no parts needed.
 

BrokenVisage

Lifer
Jan 29, 2005
24,771
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It looks like a cover for a rubber plug that allows access to the cabin. It's probably safe to drive on the trip, just make sure nothing else is hanging down.


As an aside, it looks like your heat shields are bent all to hell. The dealer will probably recommend you to replace those.

Crap, I'll make a note of that and see what they come back with after I drop it off. Thanks.
 
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