Test Group YBMXV03.2S52
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2000 BMW Z8, 2000 BMW Z3, 2000 BMW X5, 2000 BMW M5, and 2000 BMW M Roadster. However, it is still accessible from the selected car via links, so may be relevant.
Secondary Air System Monitoring General Description - At cold start, secondary air pump and valve are switched on for their normal operating function. Secondary air delivered into exhaust gas is causing a lean mixture indicated by output voltage of oxygen sensor. Any time the oxygen sensor indicates a lean mixture within the maximum time for monitoring, a counter is incremented by "one" up to a predetermined value. This fixed limit corresponds to the minimum amount of secondary air (low-flow-limit-check). For secondary air system monitoring flow chart, see Figure.