Hi, this is my first post on here but I've been finding lots of useful info from others n decided its now time to give a little back!
I have just replaced both upstream O2 senors on my 2000my 4.0 XKR following fault codes PO1646 and PO1647.
I didn't fancy draining the coolant system to then deal with the heat shield etc, so I looked to go from underneath.
Firstly, I tried a very long extension but couldn't get any purchase so I decided to undo the exhaust fron the cats n loosen the joints behind the mid box to move it aside.
It was then that I noticed the ingenious feature that Jaguar had built in, something that has now become forgotten even by them!

The rubber drain pipes from the a/c system also double as O2 sensor access holes

I can't believe that nobody else has realised this! You simply push the pipe Iin from underneath then pull back the carpet in the footwells and you have access for a long extension bar.

I fitted the socket to the sensor, fed the bar up into the car then forwards into the socket then it was in to the cabin with a ratchet and more extension bars.

This has to have been an intentional design, its just too perfect otherwise!

I will post my findings on the effeciveness of my alternative denso sensors when I have tried the car for a while.

I hope this helps somebody like it did me.

 

Do you think Jaguar intentionally made something easy?

Must have been a Monday in the design department.

 

Holy smokes. I wonder how many other hidden goodies are there that noone knows of.

 

That is a really cool discovery! Thanks for sharing.

Steve

 

Thanks for the positive comments everybody.
My guess is that if it was a "designed" feature, that the memo must have been lost before the service instructions were created, all I know is that it was the difference between 40 minutes and 5 hours for the left side!
It would be interesting to find out if the same applies to X308's and later 4.2 X100's, all I can vouch for is my 2000 4.0 SC.

 

I have cars, where I had to make my own access holes, then simply use body plugs like that lol.Due to risk of exhaust bolts snapping.

 

Too sad I did not find this earlier
Had to change my left side today, managed to get it from underneath, however did not fix my P1647 problem
I'll share my discovery of success for those who fancy getting job done from underneath the car

 

I wish I had posted this sooner, but when I was fighting, trying to get the fill plug out of my 99's transmission, I noticed that the exhaust heat deflector on the right side was loose. It wouldn't tighten up, so I removed it, to find a speed nut that would work. Behind the aluminium was a 2" hole, that had been filled with a piece of mild steel under the carpet, and no, I did not do it. I would admit hacking if I did. I didn't let someone's work go to waste, so I used it to remove the fill plug, and fill the trans, per instructions, except with a funnel and universal socket, so I wouldn't burn myself. While I had the miserable torx plug out, I went to the auto parts store, and got a real drainplug, with a hex stickong out of it, and a nice copper seal. My 928S has a hole, that {I!!} drilled under the LF fender, all nicely patched. I needed to change the clutch master cylinder, and the instructions first step is to remove the engine, to remove the brake booster and master cylinder, just to gain access to the clutch master cylinder. When everything was under warranty, I never had the occasion to replace a clutch master cyl, but now after looking at a number of 928s, they almost all have a hole cut inside the fender structure.....Learn something new every day. Make something idiot proof, and it creates a better kind of idiot......be cool.....Mike

 

Thanks for the info!

 

Where the hell does the left side Upstream O2 sensor connector go to??

How do you reach it / what do you move to get to it??

Thanks!



Jeff(waiting for the next CEL when I get this repair done)XKR

2000 XKR silver coupe w/deep dish 20s rear, 19s front.

 

Dang! Finally found it! . My JTIS is not talking with Windows 7 SP1, can anybody tell me what torque is for the upstream oxygen sensor, please?

Thanks!

 

Got JTIS Working !!
FYI Upstream O2 Sensor is 33 ft-lbs or ~ 45 Nm

 

Necroposting here, does this work for the 4.2 liter engines as well?

 

I replaced the passenger side upstream sensors a while back, and there was no access problem from the top. I used a crows-foot O2 sensor adapter with a 3/8" breaker bar/extension. Might have removed the intake tube for access, but no big deal altogether.

FWIW, you can see these sensors from the top. They are fairly high up.

 

Oh, yeah, I can totally see them, I just don't want to go through the trouble of draining the cooling system just to be able to remove the driver's side O2 sensor (P1647).

 

If you detach the coolant tank from the bracket, there might be just enough slack to set it aside and give you access. Worst case, you can use a turkey baster type of tool and empty just the tank. I agree that flushing the radiator is just a mess.

 

In my original post, I questioned whether my findings were relevant to the later 4.2 cars. I now know that the later cars have the upstream O2 sensor mounted at an angle to "aid" access! This renders the original access holes useless.
So it seems even more apparent to me that eothe, Jaguar themselves forgot that access had been provided, or that it was all just a coincidence on the early cars!!!
We will never know which, I guess!
However, for 4.0 cars the A/C drain pipes will serve as access holes for the O2 sensors.

 

Reviving this old thread which had me optimistic about an easier way to get to the bank 1 (US passenger) upstream sensor. I pulled back my carpet and found a hole with foil backed rubber tape type stuff covering it. Pulled that off but could not get to the O2 sensor, which was pretty much right in front of it. It is possible to get into the engine compartment, but not clear access to the sensor.


Pic just under glove box, carpet pulled back, US passenger side.

 

Hi Jwagner, I'm sorry that my discovery hasn't helped you, I posted about my findings on our 2000MY 4.0 XKR, I also only actually used this method for the leftside sensor as I had already fitted the right one from above. Mine certainly appears to have an access hole both sides tho. What year/engine is your car? ​

 

My car is also a 2000 XK8. Hopefully if the car also needs a sensor on the other side the access port will be there.
Thanks