Oxygen Sensor FAQ and Information

This guide will give a list of information on part numbers, location on the vehicle, and corresponding ODBII codes. All the information here relates to 50 USA States Compatible style emissions. For Jeeps with Federal emissions figuring out the location of the sensors should be fairly simple. Sensor one is before the catalytic converter and sensor two is after it.
Most after market sensors cost around $60 and from the dealer expect to pay more. Three of the four sensors for 2004 Wranglers cost around $30 for unknown reasons.

4.0L Engine
2000-2006(50 USA States Compatible)

Upstream, Front Manifold - Bank One, Sensor One
ODBII Codes: P0130, P0131, P0132, P0133, P0134, P0135
Physically located towards the front of the vehicle before the mini-catalytic converter.
~Parts~
Bosch
2000: Part #13122
2001: ???? - None specified
2002-2003: Part #13687
2004: Part #15505
2005-2006: Part #15123

MOPAR
2000: Part #56041 213AG
2001: Part #56041 943AA
2002: Part #56030 100AA
2003: Part #56031 110AA
2004: Part #56028 995AA

Upstream, Rear Manifold - Bank Two, Sensor One
ODBII Codes: P0151, P0152, P0153, P0154, P0155
Physically located towards the rear of the vehicle before the mini-catalytic converter.
~Parts~
Bosch
2000: Part #13280
2001-2003: Part #13664
2004: Part #15504
2005-2006: Part #13869

MOPAR
2000: Part #56041 213AF
2001: Part #56041 944AA
2002-2003: Part #56031 110AA
2004: Part #56028 994AA

Downstream, Front Manifold - Bank One, Sensor Two
ODBII Codes: P0136, P0137, P0138, P0139, P0140, P0141, P0143, P0144, P0145, P0146, P0147
Physically located towards the front of the vehicle after the mini-catalytic converter.
~Parts~
Bosch
2000: Part #15465
2001: Part #13687
2002-2003: Part #13718
2004: Part #15506
2005-2006: Part #15510

MOPAR
2000: Part #56041 213AF
2001-2003: Part #56041 847AA
2004: Part #56028 996AA

Downstream, Rear Manifold - Bank Two, Sensor Two
ODBII Codes: P0157, P0158, P0159, P0160, P0161
Physically located towards the rear of the vehicle after the mini-catalytic converter.
~Parts~
Bosch
2000: Part #15465
2001: Part #13691
2002-2003: Part #13691
2004: Part #15513 or #13687
2005-2006: Part #15511

MOPAR
2000: Part #56041 213AF
2001-2003: Part #56041 848AA
2004: Part #5139 021AA


1997-1999(Federal Emissions)
Before Catalytic Convertor
~Parts~
Bosch
1997-1999: 13100

MOPAR
1997: Part #5602 7916 or 5602 7917
1998: Part #5604 1212
1999: Part #56041 212AE or 56041 213AF

After Catalytic Convertor
~Parts~
Bosch
1997-1999: 13138

MOPAR
1997: 5604 1108
1998: Part #56041 213AB
1999: Part #56041 213AG

Sensor Heater Failure/Sensor Heater Circuit Malfunction
ODBII Codes: P0130, P0135, P0136, P0141, P0147, P0155, P0161
Newer oxygen sensors have built in heaters to get the sensor to operating temperature faster for better running, especially in cold climates. If the heater element fails it will not prevent the proper operation of the engine or emissions system, but the engine may run rough until the engine/exhaust is hot.

Sensor Shorted To Ground/Sensor Shorted To Voltage
ODBII Codes: P0131, P0132, P0137, P0138, P0143, P0144, P0151, P0152, P0157, P0158
Two issues could be happening here, either the sensor is wired incorrectly or has failed. If you are using universal wire in sensors, verify all the connections are in the correct places and that they are properly insulated. Again with standard original factory style sensors, ensure the insulation from the wires has not been worn through. The lower, after the converter, sensors route next to the hot exhaust pipes and while it is not common for them to melt, it is possible.