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where is the front oxygen A/F sensor #1 heater Circuit located

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where is the front oxygen A/F sensor #1 heater Circuit located on a 1999 Subaru Legacy L Wagon 2.2.

Vehicle: 1999 Subaru Legacy 30th Anniversary L Wagon / 2.2 engine

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it is located on the side of the intake tube, you will have to remove the intake tube.

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