Air Fuel Ratio Sensor
ON-VEHICLE INSPECTION1. CHECK AIR FUEL RATIO SENSOR
a. Disconnect the sensor connector.
b. Measure the heated resistance between terminals 1 (HT) and 2 (+B) of the sensor.
Standard resistance: 1.8 to 3.4 ohms at 20 °C (68 °F)
If the result is not as specified, replace the sensor.