C5 (X7) Pyramid shaped sensor under floor near exhaust?

[MattBLancs]

I've got big polystyrene number 1, with 2,4,5,6,7,11 but 3 has vanished. Not sure what 12 is but don't think have that either.

3 is just like what the 406 has.

Thanks Marc, as usual!

[bobins]

I win

It's an HF aerial for under inflation detection.

HF Rx

[RichardW]

I was just saving this...

[bobins]

How strange - the workshop manual PDFs have it as an HF aerial, the parts manual has it as a LF aerial. Perhaps it's medium wave

[GiveMeABreak]

Well of course, I knew that all along and was just testing you....

For some reason I had the idea it was hidden in the wing somewhere where the ECU is! Well sussed Robin / Richard.

[myglaren]

It is the Chinese 5G tracker and Covid injector. Bill Gates sticks them there.

[Jay-Bruce]

It's just the sort of thing PSA would do - protect a poxy bolt whilst leaving the critical hydraulic pipes with as much protection as a belly dancer with a 'G' string.

Quote of the day goes to Marc

But our front runner is Graeme:

I've got one too

I thought it was either some kind of receiver for the tyre pressure monitors? Or was a motion sensor.

Well done to Bobins and RichardW, guess y'all and Graems are our winning driver(s), like the three drivers in each le mans entry

[GiveMeABreak]

Ooh, missed that, yes, well spotted Graeme

[aerodynamica]

Bet I'm wrong

[GiveMeABreak]

No, spot in, it's the LOW frequency aerial for the TPMS, there are 2 different systems on the X7, but for vehicles fitted with this particular system you can see the component that I've marked at (15):