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Old 01-29-2011, 01:43 PM
ranger4.0 ranger4.0 is offline
Ford Ranger Driver
Join Date: Oct 2009
Posts: 581
Default o2 sensor bad? no codes is this possible?

i have obd1 which unlike obd2 doesnt constantly read the o2 sensor. It determines a sensor being bad by checking to see if it stays lean or rich for a full 30 seconds and if it passes this test then the computer thinks the sensor is good. My question is i got 5 mpg less than i should which can be caused by a bad 02 sensor, can my o2 sensor on the right side be bad and the computer not know it?
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