I understand that this code represents an emission problem, most likely a oxygen senor failure. Is there any way to determine in which bank this sensor is located?
Okay, good, that makes it a bit easier. That code refers to sensor B1S1 or Bank 1, Sensor 1. Bank 1 refers to the side of the motor that has cylinder #1. Since you have an in-line six cylinder, that part is easy since there's only one side. Sensor 1 refers to the sensor before the catalytic converter. Since you have only one bank, and one exhaust pipe, that means its the O2 sensor before the catalytic converter.
You only have two O2 sensors, one before and one after the catalytic converter. Check the wiring and connector on the sensor before the catalytic converter and if all seems good there, then replace the sensor itself and see if that does the trick.
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the engine is a 4L six cyl. in a 2001 jeep grand jeroke.
Which engine do you have in this vehicle?
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