DTC P0153: Ho2S Slow Response - Bank 2, Sensor 1: Description

PCM continuously monitors Heated Oxygen Sensor (HO2S) activity. PCM counts number of times that a rich-to-lean and a lean-to-rich response is indicated. Then, the PCM adds the amount of time taken to complete all transitions for a 100 second test period. With this information, an average time for each transition can be determined. If average response time is too slow, a DTC P0133 will be set. A lean-to-rich transition is indicated when HO2S voltage changes from less than 300 mV to more than 600 mV. A rich-to-lean transition is indicated when HO2S voltage changes from more than 600 mV to less than 300 mV. An HO2S that responds too slowly is likely to be faulty and should be replaced.