Mercedes A Klasse Hybrid Tire Pressure ABS and Steering Issues

I had a similar issue with my Volvo, starting with a Tire Pressure warning and then the ABS light. I initially suspected a flat tire or a faulty tire sensor. Have you inspected the tires for punctures or damage? Even a small nail can cause slow pressure loss. Are you certain all tire sensors are functioning correctly? A diagnostic scan might reveal if one is sending incorrect readings. Has the steering issue always been concurrent with the pressure warning?

I've visually inspected the tires for punctures and found none. I haven't done a diagnostic scan to assess the tire sensors. Could a single malfunctioning tire sensor induce the ABS activation and power steering difficulty? How could a tire sensor affect the power steering?

It's possible, though perhaps not directly. A significant pressure loss in one tire, even without a visible puncture, could trigger the ABS system, particularly during cornering or braking. The increased effort in steering might be related to the ABS intervention, or it could be a separate issue made worse by the tire pressure problem. In my case, with the Volvo, it was a defective valve causing slow pressure loss. I'd recommend having a workshop inspect the valve stems and sensors and perform a thorough diagnostic check. Do not delay a visit.

I took the vehicle to a mechanic, and the issue was a defective valve in one of the tires, resulting in gradual pressure loss. Replacing the valve, along with a sensor check, fixed the problem. The total cost was approximately 280€.