Pickup (California 22R)

Check O2 sensor heater resistance. Using an ohmmeter, measure resistance between terminals "B+" and "HT". See Fig 1. Resistance should measure 5.1-6.3 ohms at 68°F (20°C). If resistance is not within specification, replace O2 sensor.

Fig 1: Checking O2 Sensor Heater Resistance (Pickup 22R Calif.)

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