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Heated Oxygen Sensor Heater On-Vehicle Inspection

WARNING: This page is about a different car, the 2004 Suzuki XL-7 and 2004 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect HO2S-1 or -2 coupler.
  2. Using ohmmeter, measure resistance between terminals "VB" and "GND" of HO2S coupler (1). If found faulty, replace HO2S.
    NOTE: Temperature of HO2S affects resistance value largely.
    Make sure that HO2S heater is at specified temperature.

    Resistance of HO2S heater 

    HO2S-1:  5.0 - 6.4 ohm at 20°C (68°F)

    HO2S-2:  11.7 - 14.3 ohm at 20°C (68°F)

    Fig 1: Checking Heated Oxygen Sensor Heater
    G02263818Courtesy of SUZUKI OF AMERICA CORP.
  3. Connect HO2S coupler securely.
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