DTC P013A-00: O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 2: General Description
WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.
The rear Heated Oxygen Sensor (HO2S) is mounted on the rear side of the catalytic converter (warm up catalytic converter) or in the rear exhaust pipe, which is able to detect catalyst efficiency. The rear HO2S produces a voltage between 0V and 1V. This rear HO2S is used to estimate the oxygen storage capability. If a catalyst has good conversion properties, the oxygen fluctuations are smoothed by the oxygen storage capacity of the catalyst. If the conversion provided by the catalyst is low due to aging, poisoning or misfiring, then the oxygen fluctuations are similar to signals from the front oxygen sensor.