Oxygen sensor replacement cost Oxygen sensor replacement cost varies based on whether the sensor is actually an old style oxygen sensor or actually air/fuel ratio sensor. Many people mistakenly call and air/fuel ratio sensor, an oxygen sensor. While an older oxygen sensor costs around $80, it’s not uncommon for an air/fuel ratio sensor to cost almost $400 for the part alone. To learn more about the difference between an O2 sensor and an air/fuel ratio sensor, see this post. The sensor replacement cost also varies by its location. Upstream sensors … Read More
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