DTC P0153: 2/1 O2 Sensor Slow Response: Description

Engine coolant temperature must be more than 147°F (64°C) for monitor to run. To run monitor, drive vehicle at 10 MPH or more with throttle open for 2 minutes. Stop vehicle and let engine idle with transmission in Drive. DTC will set in Powertrain Control Module (PCM) when PCM senses 2/1 HO2S voltage is switching from less than .27 volt to more than .62 volt and back fewer times than required. Possible causes are: exhaust leak, high resistance in signal circuit, high resistance in sensor ground circuit or defective HO2S.