Air-Fuel Ration (A/F) Sensor: Inspection

INSPECT HEATER RESISTANCE OF A/F SENSOR
1. Disconnect the sensor connector.
2. Using an ohmmeter, measure the resistance between terminals +B and HT.
  Resistance: 1.8 to 3.4 Ω at 20°C (68°F)
  
  Fig 1: Measuring Resistance Between Terminals +B And HT Using Ohmmeter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the resistance is not as specified, replace the sensor.
  
  Torque: 44 N.m (450 kgf.cm, 32 ft.lbf)
3. Reconnect the sensor connector.
INSPECT OPERATION OF A/F SENSOR (See DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1) )