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post #1 of 3 Old 03-31-2014, 05:56 PM Thread Starter
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1999 XJ Cherokee 
Join Date: Mar 2014
Location: baysid
Posts: 4
P0131- oxygen sensor bad or something else?

Hey all.

I have a 1999 cherokee around 100k miles. CEL displays P0131 which is 02 sensor bank1 sensor 1 voltage low. This sensor is located before catalytic converter.

Since the voltage is low, I believe this means it is running lean which results in too much oxygen being let it in.

At times, the car runs a bit rough at idle.

I have located the sensor but it seems the plug goes up to the engine. My hand cant get in there to unplug it if I wanted to change it. Any Ideas?

Also I just want to know what the other issues can be besides the 02 sensor being faulty.

I do not see enough of the wire to see if there is a short. Where is the connector that goes to the engine compartment located?

Any ideas and experience, I would appreciate.


Last edited by Evan1989; 03-31-2014 at 06:07 PM.
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post #2 of 3 Old 03-31-2014, 06:24 PM
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2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 25,782
Either a faulty O2 sensor, O2 sensor wire harness issues, or a cracked exhaust manifold. Cracked exhaust manifolds are very common.

P0131 JEEP O2 Sensor Circuit Low Bank 1 Sensor 1
- Check Engine Light ON
- High Fuel Consumption
- Excessive Smoke from Exhaust
Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty fuel injectors
- Intake air leaks
- Exhaust gas leaks

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post #3 of 3 Old 03-31-2014, 10:11 PM Thread Starter
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1999 XJ Cherokee 
Join Date: Mar 2014
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Posts: 4
thanks for the reply.. how would i check if there is a short if I cant even get my hand up enough to disconnect the sensor plug and see any of the other wires? Is there a way to access it from the the hood area
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