Boxer low tire pressure ABS and steering issues

Sounds like more than just a flat. Is it just one wheel, or are multiple pressures low? Have you checked if the pressures are actually low with a tire gauge, or are you just going by the warning light? A defective TPMS could also cause the light.

I did check the pressures with my own gauge, and yep, low alright. Could it be a dodgy valve? Heard that can cause slow leaks, especially with all the potholes around here.

A valve issue is definitely a contender, especially if you're experiencing pressure loss. Given the ABS light and steering issues alongside, I'd strongly advise getting it checked at a workshop rather than just inflating the tires. Could be affecting your ABS sensors.

Thanks! Took it to the shop, and you were spot on. Defective valve causing the pressure loss, messing with the ABS and power steering. Cost me 280€ to sort, but at least it's fixed!