Part numbers: Walker 25025109 (upstream), 250241138 (downstream), 250241140(mid)

I recently started noticing a bit of roughness at idle, poor fuel mileage and an intermittent O2 sensor heater circuit bank 1 sensor 1 DTC, so it was time to renew the oxygen (O2) sensors.
My 2013 XJL Supersport has ticked just over 100K miles and I am unfortunately out of the extended O2 sensor warranty that Jaguar offered due to the premature failure rates of the OE Bosch sensors.

The AJ133 V8 has six oxygen sensors, three on each bank of cylinders- upstream, downstream, and also in the center of the catalyst. The widely accepted service life of oxygen sensors is around 100K miles and common failure symptoms include slightly rough fueling, poor gas mileage, and an associated DTC. Replacement of all six of these sensors at a dealer or independent shop costs upwards of $1500, so it's time to DIY. I haven't noticed many X351 or Range Rover owners doing this service themselves, and they have my empathy. These sensors tend to seize up in their threaded bungs due to the intense heat cycling of the exhaust system, and removal is quite tedious with low visibility.



The aftermarket will sell you a curved O2 sensor tool or a cast iron tool. I own both tools, but the upstream O2 sensors gave me problems. The curved tool did not give me enough leverage to crack them loose, and the cast iron tool was too short to engage around the wide exhaust pipe. I took the cast tool to my shop and modified it to increase the offset, and fabricated another small ⅜" offset socket to keep the axis of rotation of my socket wrench centered about the sensor. Centering the axis of rotation of the tool prevents too much off-axis load on the hex head of the sensor, which could strip and cause more difficulty.


Homemade tools!

Here's the tool in situ:



As you can see, access to the upstream sensors on the V8 is completely blind. After soaking in penetrant overnight, my homemade tool cracked both of them loose and I was able to replace all six sensors and clear the DTC in SDD. My Jaaag is back to running smoothly for less than $500, and we will see what fuel mileage improvements I get.

 

Jaag Driva, I have a 2015, XJL with the V-6, AWD engine. Thanks for the pics. So my question is, I can't find the location of, bank 2, sensor 3. There is nothing downstream under the driver's side. Any chance you know where mine is located? Is there a location maybe further downstream? Got a pic?

 

I can't speak for the V6, but on the V8 there are three sensors per side. One on top, one on the bottom after the cat, and one placed right in the middle of the catalyst. They are easy to visually locate once you're under the car.

 

We have a 2014 Range Rover Sport with the V6 engine, and it's at 150K miles on the original O2 sensors. I wonder if they are the same ones as yours.

 

RockAuto lists the same Walker part numbers for the oxygen sensors on the V6.

It's worth noting that the O2 sensor extended warranty is longer on the V6 models, at 150K miles compared to 120K for the V8. Take a look at this thread here: https://www.jaguarforums.com/forum/f...-miles-244795/

jaguarguy, if yours is a 2015 then you should be within the window- I'd make a phone call to the dealership.

 

Wow - 150k is a very good warranty!
And the long warranties of emission control parts are not by choice of manufacturers, they're mandated by the EPA.

 

Boy those O2 sensors were mangled by the time you got them out!
Here is a good diagram of the O2 system.




There was some confusion in another thread?
The O2 sensors are identical from side to side. No RH or LH. They are NOT the same in position 1,2 or 3. Wire length must match up too.
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Now that's a GREAT picture. Very helpful!

 

Yes, the dealership has confirmed that I am within the 120k and the 10 year prohibition. Goodnews there, thanks!

 

That was easy!

 

I was going to replace mine next weekend on my 2010 XF 5.0. I saw the manual calls out to remove cats to replace it but I might try your way you did here. I think I’ll spray the sensors awhile with some pb blaster.

 

I have never removed a cat to replace an O2 sensor and if the manual says that it's wrong.
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have you removed the upstream sensor on the AJ133 before?

 

Yes and yes. That is wrong!
Please I have worked on these cars for years now. I have removed O2 sensors and both cats multiple times.
Now if you want to remove something to get better access OK but I have a lift and can get to all the O2 sensors.

Think about it for a minute?
What a fiasco it would be to design a car that requires the exhaust system to be dismantled to perform normal maintenance? O2 sensor's WILL be replaced at some time as they do wear and go bad.

Can you post exactly what the manual says?
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yes I will post it once I get home from work. Did you use a similar contraption like in this thread to reach the upstream sensors?

 

Yes it does require some different tools and adapters but so does all mechanic work so nothing different. The more tools the better just to give you options on how to attack the problem. I had a bad cat but could NOT get the nuts and studs off because of rust. So that required heat and I used my Oxy-Acetylene torch. BUT that also did not work because of the tight quarters and I was afraid of damaging something with the torch since it's all so packed and tight.

Had to take the downstream portion of the exhaust off first then I cut one of the mounting studs in half so I could slide the section of the exhaust with the cat in it straight back and off. Then I put the cat and pipe on my bench and really put the heat to the studs and nuts so they were red hot. Still took 30+ minutes working it back and fourth before I got any movement at all. Just kept at it going back and forth with lots of penetrant oil until I got it unscrewed. I purchased a replacement stud and nut for about $15 from Jaguar and I made sure all the threads were well saturated with high-temperature anti-seize.

Sure wish they would use that at the factory as it would make life so much easier for us DIY-er's.
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Just did mine yesterday. I made a similar contraption for the crows foot socket and then used a swivel with a 10” extension. Breaker bar wasn’t budging so I hooked up 1/2” impact and it backed right out for both sides. I also found out mine have a different style upstream o2 sensor. I guess after a certain vin # they were switched for my 2010 XF 5.0 Supercharged. Also my model only has 2 sensors for each side: 1 upstream and 1 in the cat. Mine required part

C2P16396 but C2P8810 was the other one, had a completely different style and connector.