Rear heated oxygen sensor (HO2S), aging

The control module checks the rear heated oxygen sensor (HO2S) dynamics. The control module checks that the probe has registered both lean and rich fuel mixtures. If this is the case, a signal is transmitted so that the probe signal is changed. Diagnostic trouble code (DTC) ECM-2A1A / 2B1A is stored if the rear probe has still not registered lean or rich fuel mixture. The diagnostic trouble code (DTC) is also stored if the switch over time from lean to rich fuel mixture is too long.