Peugeot 107 tire pressure ABS and steering issues

Good day. The symptoms you describe, specifically the concurrent illumination of the ABS warning lamp alongside the low tire pressure alert and the reported effects on steering, are indicative of a potentially compromised wheel speed sensor or a related fault within the tire pressure monitoring system (TPMS). Erroneous readings from a defective tire sensor, combined with the ABS involvement, could indeed be the source. Have you checked your tire pressures manually to confirm actual pressure loss?

I've checked the pressures, they seem fine. You mentioned TPMS, could a valve issue cause all this?

Indeed, a defective valve within the tire, particularly one integrated with the TPMS, could precipitate the issues you are encountering. A compromised valve can lead to gradual pressure loss, potentially below the threshold required to trigger the TPMS warning. Furthermore, the sensor malfunction can then interfere with the ABS, due to both systems relying on similar rotational data. I suggest a workshop visit to inspect the valve and TPMS sensor.

Cheers for the advice. Turns out the valve was leaking slightly, causing all sorts of issues. Cost me 280€ to sort out.