Seat Arosa ABS Fault

The symptoms you describe are indicative of a potential fault within the electronic stability control system, specifically related to the lateral acceleration sensor. The ABS lamp illumination, coupled with the error code, strongly suggests this component is malfunctioning. I encountered a similar issue with a Volvo some time ago. In that instance, the yaw rate sensor was the culprit. Have you checked the steering angle sensor readings? Erroneous data from this sensor can sometimes trigger similar fault codes, leading to a misdiagnosis.

Steering angle sensor readings, huh? I haven't checked that specifically. How would bad readings there cause problems with the lateral acceleration sensor? Is it like, one domino falling and taking others with it?

Affirmative. The steering angle sensor provides crucial input to the electronic stability control system. Think of it as the system's 'eyes,' constantly monitoring the driver's intended direction. The lateral acceleration sensor, or yaw rate sensor, acts as the 'inner ear,' detecting the vehicle's actual movement. If the 'eyes' are sending incorrect information, the system may misinterpret the vehicle's response, potentially triggering a fault related to vehicle stability. Given the cost implications of replacing the control unit (approximately 1000€), I would strongly advise a thorough diagnostic assessment by a qualified technician before proceeding with any repairs. Ensuring correct wheel alignment is also paramount for optimal vehicle stability.

Cheers for the advice! I bit the bullet and took it in. Turns out you were spot on, the lateral acceleration sensor had gone belly up. New control unit and wheel alignment later, and it's all sorted. Cost a bomb, mind you, about 1000€ all in!