Question about 1994 Jeep Cherokee Country
O2 voltage should vary between about .10 volts and 1.0 volts with the engine in closed loop mode. low volts mean lean, high, rich, if the voltage is always low (<.20V) even when you goose the throttle chances are the O2 is done. Remember high/low voltage readings indicate lean rich conditions, a failed O2 has almost no drive symptom, just a check engine light.
Posted on Aug 27, 2008
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Removal & Installation
WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
NOTE Allow the O2 Sensor to cool down before conducting the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker.
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