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    Subaru Car 1998-05

    Heated Oxygen Sensor (H02S)

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    On the SOHC engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On the DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the catalytic converter.

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    Fig. Oxygen sensor location-Baja 2.5L SOHC engine



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    Fig. Oxygen sensor location-Baja 2.5L DOHC engine

    On the 2.0L engine the front (A/F) oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter. On 1998-2002 vehicles equipped with the 2.5L SOHC engine, the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter. On 2003-2005 vehicles equipped with the 2.5L SOHC engine, the front oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On 2004-2005 2.5L DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter.

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    Fig. Oxygen sensor location-Impreza 1998-2001 2.2L engine



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    Fig. Oxygen sensor location-Impreza 1998-2002 2.5L SOHC engine



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    Fig. Oxygen sensor location-Impreza 2002-2003 2.0L engine



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    Fig. Oxygen sensor location-Impreza 2004-2005 2.5L DOHC engine



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    Fig. Oxygen sensor location-Impreza 2003-2005 2.5L SOHC engine

    On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter. On 1997-2001 vehicles equipped with the 2.5L SOHC engine, the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter. On 2002-2005 vehicles equipped with the 2.5L SOHC engine, the front oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On 2004-2005 2.5L DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On 2005 3.0L engine the front oxygen sensors are located in the front section of the front catalytic converter. The rear oxygen sensors are located in the rear section of the front catalytic converter. There are two front catalytic converters, but only one rear catalytic converter.

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    Fig. Oxygen sensor location-Legacy 1997-1999 2.2L engine



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    Fig. Oxygen sensor location-Legacy 1997-1999 2.5L SOHC engine



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    Fig. Oxygen sensor location-Legacy and Outback 2000-2001 2.5L SOHC engine



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    Fig. Oxygen sensor location-Legacy and Outback 2002-2005 2.5L SOHC engine



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    Fig. Oxygen sensor location-Legacy and Outback 2005 2.5L SOHC engine



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    Fig. Oxygen sensor location-Legacy and Outback 2004 2.5L DOHC engine



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    Fig. Oxygen sensor location-Legacy and Outback 2004-2005 2.5L DOHC engine



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    Fig. Oxygen sensor location-Legacy and Outback 2002-2004 3.0L engine



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    Fig. Oxygen sensor location-Legacy and Outback 2005 3.0L engine

     
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