992 C2 S rear tyre slowly losing pressure - no puncture

[9k rpm]

A bit of an odd one hopefully people can give me a good view on!

I have a 2019 992 C2S that I’ve owned for just over a year. End of last year I noticed the near side rear was losing about 1PSI in pressure a week. Was topping up as have a compressor but it was a concern although I only do about 50 miles a week at present. The rear tyres were well worn so in March I had them both replaced through a local garage supplied via Blackcircles (P Zeros matching the fronts which had loads of tread).

I thought there may have been a slow puncture and it would be resolved but there is still pressure loss at a virtually identical rate.

Given it’s clearly not the tyre what could it be?

I’ve done some research and it seems to be pointing at the valve or the bead. Is there an effective way to check? I’m planning on taking it into the garage to get them to have a look but would be good to have an idea of what it is.

Thanks!

[9k rpm]

Thanks for the replies.

I have TPMS so doubt they replaced the valve. They didn’t mention any cracks either. Will get the valve looked at first I think.

[9k rpm]

futie said:

Well now that's interesting. I have the same thing - left rear. 2019 992 C2S also ... yours isn't red is it

Interesting! No, GT Silver.

[9k rpm]

Discombobulate said:

Do you have a tub big enough to put the whole wheel under water and look for bubbles from valve, rim or tyre bead?
Or a swimming pool

I don’t even have a jack to get the car in the air to get the wheel off!