DTC P0159: 2/2 O2 Sensor Slow Response: Description

Monitor will run with engine idling. If Powertrain Control Module (PCM) senses that 2/2 HO2S voltage switches from less than .39 volt to more than .58 volt and back fewer times than required, monitor will run again only under the following conditions: ambient/battery temperature more than 44°F (7°C), barometric pressure more than 22.13 in. Hg, battery voltage more than 10.5 volts, MAP 11.79-18.15 in. Hg, engine speed 1350-2200 RPM and vehicle speed 50-65 MPH. If PCM senses that 2/2 HO2S still switches fewer times than required, DTC will set in PCM memory. Possible causes are: exhaust leak, high resistance in signal circuit, high resistance in sensor ground circuit or defective HO2S.