Master low tire pressure ABS fault

The combination of a low tire pressure warning alongside ABS and power steering malfunction suggests a possible correlation. Verify tire pressure with an external tire gauge to negate sensor error. Discrepancies between onboard sensors and actual pressure readings could indicate valve failure leading to gradual pressure loss, subsequently triggering associated system faults. Could you confirm if all tires exhibit nominal inflation, and if the pressure loss is consistent across all wheels or isolated?

Thanks for the quick reply. I only checked them visually, didn't use a gauge, to be honest. I'll check properly in the morning. If it is just one tire, what does that suggest? I can't hear any obvious air leak by the way.

If a single tire displays significantly lower pressure despite inflation, it supports the hypothesis of a localized valve defect allowing slow egress of air. This pressure differential can adversely affect ABS functionality, whilst increased steering effort could indicate consequential strain on the power steering system due to compensatory measures. In such instances, vehicular diagnosis by a qualified technician is strongly advised.

Appreciate the advice. Took it to the shop, you were spot on. Defective valve in one tire, causing the pressure loss and messing with everything else. Cost me 280€ to get it sorted. Thanks again!