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Inspection Component

Disconnect the battery negative (-) terminal.
Disconnect the Heated Oxygen Sensor (HO2S) connector.
Measure resistance between the HO2S terminals.
Front: Pin 4 to Pin 5

Rear: Pin 3 to Pin 4

Front

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Rear

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Compare the measured resistance with the specification.
Specification:

Front: 2.8 - 4.5 Ω

Rear: 5.4 - 6.6 Ω