DTC P0159: 2/2 O2 Sensor Slow Response (With CALIF. Emissions): Description

2/2 Heated Oxygen Sensor (HO2S) voltage is monitored with engine running at idle. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/2 HO2S voltage is switching from less than 0.39 volt to more than 0.65 volt and back less times than required. Possible causes for DTC to set are: exhaust leak, defective 2/2 HO2S, or defective connectors or wiring.