Engine light on 2003 Honda Accord?
Changed sensors but light keep coming on and only average 20 mpg
See a mechanic with a labscope/scan tool.
This must be the P2196 (Oxygen Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1) your earlier questions mention. You can replace the sensor all you want - it is not the sensor that is at fault; it is only telling you Bank 1 is running too rich. Since bank 2 is not doing the same, odds are you have a dripping fuel injector. A professional should be able to find it quickly.
Try keeping your foot out of it.
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