Rear O2 Sensors
#1
07-15-2014, 11:13 AM
Rear O2 Sensors
Took the XJR in for an alignment this morning and as luck would have it the CEL came on! Dealership called to let me know that the rear O2 sensors are bad. Said the heaters for the sensors are not working.
Question is...are the aforementioned "heaters" part of the sensor? Or is there something else in the exhaust that heats the sensors? Dealership wanted over 1k for replacement. RockAuto has Denso rear sensors for under $50 a piece. If replacement is plug-and-play, the answer on who will be doing the work is easy!
Question is...are the aforementioned "heaters" part of the sensor? Or is there something else in the exhaust that heats the sensors? Dealership wanted over 1k for replacement. RockAuto has Denso rear sensors for under $50 a piece. If replacement is plug-and-play, the answer on who will be doing the work is easy!
#2
07-15-2014, 03:46 PM
Senior Member
FlamurAdili
1K is excessive for O2 sensors if that is all that is wrong with the car.
The rear O2 sensors unplug and unscrew. The heater is part of the sensor.
The big pain of the job is getting under the car to access the sensors. The electrical plug end is mounted on a small bracket that is connected to the underside of the transmission.
Remove the small (8mm I think) bolt holding the bracket in place, unplug the sensor and use an open ended wrench to unscrew the sensor. You may need a hammer to tap the wrench to help break it loose. Be careful not to round of the head of the 02 sensor.
Repeat the process for the other side and reassemble.
You will need to get the CEL reset if you don't have a engine code scanner to reset it yourself.
Good luck.
1K is excessive for O2 sensors if that is all that is wrong with the car.
The rear O2 sensors unplug and unscrew. The heater is part of the sensor.
The big pain of the job is getting under the car to access the sensors. The electrical plug end is mounted on a small bracket that is connected to the underside of the transmission.
Remove the small (8mm I think) bolt holding the bracket in place, unplug the sensor and use an open ended wrench to unscrew the sensor. You may need a hammer to tap the wrench to help break it loose. Be careful not to round of the head of the 02 sensor.
Repeat the process for the other side and reassemble.
You will need to get the CEL reset if you don't have a engine code scanner to reset it yourself.
Good luck.
#3
07-15-2014, 04:41 PM
Senior Member
I just changed upstream and downstream O2 sensors located on the passenger side catalytic converter. I put the car up on jack stands as high as my 3 ton jack would allow and found plenty of room to work. I think the most challenging aspect is breaking the sensors loose if they've been in for a long time. If you purchase from RockAuto, they list sockets and wrenches especially designed for O2 sensor removal. They will come up when you select one of their O2 sensors.
For example, the deep socket has a slot in the side that allows the sensor electrical wires to not interfere. You can just cut the wires, but if you have any trouble getting it out you're stuck with a ruined sensor. If you consider that my Jag dealer wanted to charge over $600 to put in new plugs, $1k for the sensors makes sense. Good grief. It's a very do-able DIY job on the O2 sensors.
For example, the deep socket has a slot in the side that allows the sensor electrical wires to not interfere. You can just cut the wires, but if you have any trouble getting it out you're stuck with a ruined sensor. If you consider that my Jag dealer wanted to charge over $600 to put in new plugs, $1k for the sensors makes sense. Good grief. It's a very do-able DIY job on the O2 sensors.
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