3FE engine code 28

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Dec 2, 2003
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The light hadn't come on but I wanted to check it anyway becuase I'm not seeing the mileage I think I should be seeing.

The manual says this is the oxegen sensor, but so does engine code 21. Does anyone know which one this is? I replaced them both last July so I don't know why it's coming back on. Maybe they didn't reset it before?
 
Reset and see of the code comes back.
 
Where they OEM sensors, or aftermarket? (not trying to get after you, genuinely curious)
 

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