Q: Is it common to replace Oxygen sensors as a normal tune-up item? What do they cost?
A: Oxygen (O2) sensors should be replaced as a preventative maintenance item. Check your owner’s manual for the specific maintenance timeline. In general, O2 sensors should be replaced between 50,000-100,000 miles depending on the style of sensor and vehicle type. Your vehicle could have as many as four O2 sensors. A correctly functioning O2 sensor could increase fuel economy as much as 10-15% over one that is not working properly. O2 sensors typically cost between $30-$100 each.