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
2 answers
Try the Estimator; http://repairpal.com/estimator
Search for the service "Oxygen Sensor Replacement"
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.