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Why does check engine light stays on 1999 4.0 ranger replaced right bank sensor?
Wiki User
∙ 14y ago
In order to completely answer this question you would need to provide some additional information. Do you know what code(s) were in the system prior to the sensor being replaced? Was it a hego (oxygen) sensor or cat monitor sensor that was replaced. In most cases a hego sensor will not be the culprit. These sensors usually get replaced mistakenly because there is a rich or lean code for that bank (side of engine). A rich condition could be caused by a leaking fuel injector and a lean condition could be caused by a vacuum leak or a stuck closed injector. Hego sensors do go bad. If they fail to read the oxygen content in the exhaust it will through the light on. The other type of sensor failure is in the sensor heater circuit. The sensor has a built in heater that runs on 12 volts. It heats the sensor for proper operation. So again, you would need to provide more info. The dealer would be able to install a computer with software called IDS. They can monitor the fuel trims and perform certain test to determine the problem. Good luck :o)
Wiki User
∙ 14y ago
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