What is Volvo 960 fault code 411?

The Volvo 960 fault code 411 typically indicates an issue with the vehicle's idle air control system, specifically related to the idle air control valve (IACV) or its circuit. This code can result from a malfunctioning IACV, vacuum leaks, or issues with the engine management system. It may lead to irregular idle behavior or stalling. Diagnosing this code often requires inspecting the IACV, checking for vacuum leaks, and ensuring that all related electrical connections are secure.