Checked the heat shield
Having noticed that a bit of the heat shield was loose, when I last washed the A2, today I put the car on the ramp to assess the situation:
The loose shield was due to the fastener being completely corroded (they look like steel to me) and I guess then having contact corrosion with the aluminium shield. Looks like a new small shield. I hope the big shield is OK.
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I then looked at the other fasteners. Here's a general view of under an A2 (not mine!) with the rivets marked:
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The fasteners attached to the fuel tank (circled red) were very corroded. I guess Audi thought they could use steel as the tank is non metal.
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The ones attached to the floor pan (orange) were fairly corroded.
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The next least corroded were the one attached to the battery box (green):
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Not corroded were the ones along the "transmission" tunnel (blue).
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I couldn't release the fastener on the broken heat shield, despite some WD40, so as a temporary and very crude fix I screwed on a bit of an old angle bracket:
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So, looks like a new small heat shield (anyone know the £ damage?). In this recent thread
http://www.a2oc.net/forum/showthread.php?30198-Rivnuts&highlight=heat+shield Matt is going for aluminium rivnut size M6 but he doesn't say what length. If you're reading this Matt perhaps you can say what length you used.