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

2/1 Heated Oxygen Sensor (HO2S) voltage is monitored with engine coolant temperature more than 147°F (64°C), after reaching a vehicle speed of 10 MPH, and throttle remains open (off idle) for 2 minutes and subsequently bringing vehicle to a stop and allowing engine to idle in Drive. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/1 HO2S voltage is switching from less than .27 volt to more than .62 volt and back less times than required. Possible causes for DTC to set are: engine mechanical problem, exhaust leak, defective 2/1 HO2S, defective connectors or defective wiring.