What is the cost to replace an oxyigen sensor on 2003 Pontiac Montana

The light came on to :"Service engine soon" It was diagnosed to replace the sensor.

Asked by for the 2003 Pontiac Montana
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Search for the service "Oxygen Sensor Replacement"
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it cost me about $40 for the part, $50 deposit to rent the tool you need to remove/install the sensor. The real experience was finding and reaching the sensor.