EcoFLEX for 2015 Vauxhall Corsa SRi, losing tyre pressure
Thanks for your question and apologies for the delayed response.
It's difficult to do a diagnostic without having seen the vehicle. We would need to know the extent of pressure loss and isolate the causes of the problem (e.g. valve, damaged wheel rim). However generally speaking it is unlikely that new tyres would be porous.
Hope this helps.