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Replaced one of the sensors about a month ago.Today check engine light came on and I went to auto zone to see what was up.They told me 2 o2 sensor were bad.The one I replaced and another on the other side.What causes them to fail like that?
Tune needs to be set to disable, its supposed to throw a light as you have changed your carbon footprint, your illegal, just have tuner remove the DTC trigger !!! lol
Did you replace the O2 sensor with a Motorcraft or Ford sensor? If you used an Auto Zone no-name brand, which was probably half the price, be advised that they suck.