V90 Radar Sensor Malfunction

I had something similar on my V90. Adaptive cruise control went haywire, and the collision avoidance system threw a fit. Did you check if the sensor itself is physically obstructed or dirty? That was my problem.

Thanks. Where is the sensor located, and how do you recommend cleaning or inspecting it?

For me, it was just road grime caked on the front sensor after a long drive. I'd still recommend a workshop visit; they cleared the error memory after I cleaned it. Cost me 45€.

Thanks for the advice. Cleaning the sensor and clearing the error memory at the workshop resolved it, just like you said. Total cost was 45€.