2008 Nissan Altima - Codes

Positive about the number. Took a photo of the scan.
It reads, “Heated Oxygen Señor HeaterControl Circuit Low Bank 1 Sensor 3 - open circuit"
What is an O2 sensor failure? Do I need to take care of

it soon rather than just before inspection?
Have called two shops. Both refused to name a price.

One gave a range $200- 900, dependent on what his mechanic

would tell him is needed. This happened a few days after an

oil change. Am wondering whether that shop triggered the Check

Engine….

Thank you!