Unless you have a scanner that can monitor the O2 sensors, I would replace the sensors. The ECM monitors front and rear sensors, and compares readings to determine if the converter is doing its job. Does the vehicle have, or ever had, a misfire problem? If not repaired quickly, the converter can be damaged and cause a cat efficiency problem that may not show up for some time
2013 Explorer Limited
87 Ranger, XLT
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