It is very true that these ladies are extremely nice cars when they are kept as nice cars.
It is also true they can be a very large albatross when they are not properly cared for in
the manner they need to be. Determining that condition could be misleading when having
only receipts in-hand as proof of concept. Needless to say the transmission is one of the
"big-ticket" items which causes many of these otherwise great vehicles to become parts
cars. A twenty year old transmission could be difficult to bring back to "like-new" status
even under the best conditions. So, I am sure your "WOW!" is justified.

 

I opted for Royal Purple Max full synthetic since it was a bit easier on the wallet than the rest that would work. Lots of opions on that.

I see i should be adding a pressure relief mod too along with the filter but thats jacking the price too much.
Especially since the p1647 code and whats involved with that. Finally settled on the location being driverside which was depressing.

Starting to think perhaps my brother really didn't like me that much. ): Trans 1st then we'll see who I can rope in to do the sensor. I'd pay to not have to do that one. Any takers??

 

As I can see it's compatible with lt71141 royal purple not bad
Fill it to proper level and see how the transmission behave
The filter 35$ MANN H2522XKIT
Let's focus on the transmission all other things are easy compared to the transmission issues

 

That code is for a bad O2 sensor? Change it and see if it's gone? It's on bank 2 which is the left side of the engine when your sitting in the drivers seat. Here is a thread from our UK friends with more info.
Jaguar Code P1647

One BIG suggestion that has caught a number of people off guard?
FIRST loosen the fill plug BEFORE you drain the transmission fluid! That fill plug is usually really tight too so plan on using a cheater pipe on your Allen wrench.
.
.
.

 

Thank you sir. All the parts arrived today including TransGo pr valve replacement. Should have extra pan bolts just incase but they were out so I've got to come up with something.

After reading 100k to 108k~ is prime time for the A drum failure and at 100,400 I shut her down. Plus the yellow light and gearbox fault message reappears and last check it was on. Shutting off and turning back on didn't clear it this time but no matter it needs serviced so why ask for trouble.

Am also watching my battery closely and am wondering if a newly installed wireless backup camera is getting power when it shouldn't be so I'm about to disconnect that to see what happens. It is the variable I've put into the equation and by coincidence the gearbox fault shows up shortly thereafter. Just did an 800 mile trip without any of that nonsense. Makes one think perhaps theses are related?

Wish me luck!

 

I'm looking into this as I think I may have a drain after installing a wireless backup camera. Timing of these go hand in hand. Glad you brought that up.

Still doing the fluid/filter w pres relief valve mod as its overdue. All parts in hand so onwards.

Appreciate your input.

 

I may be a bit late with this advice but i wouldn't put there anything out of approved fluids list, and certainly not lt71141 Compatible stuff unless of course you love suffering and doing jobs twice
I wouldn't go cheap on filter too, some tend to be noisy and obstruct the flow, if you can't get oem go filtran, people swear by them.

 

You're not too late and thanks. There's so many opinions that I've not done the service yet and am seeing a local jag specialist Monday to sort all of this out. Especially since the p0715 code appeared and is a daily ritual of resetting code to clear limp mode. If I do that at least twice it goes back to acting right for the rest of the day which is confusing at best.

I can literally hear the slight idle flaw from a cold start that tells me its gonna pull that stunt. Thats likely my p1647 issue but it didn't pull this every time but now its a morning ritual. The other clue was when I'd Shift to reverse when cold, if it banged into gear its a guarantee it'll be in limp mode as soon as I drive off and tranny does its first shift. This too wasn't all the time but now its getting to be.

The baffling part is why does it quit after a couple resets and drive normally all day long after that?? I mean if that sensor is toast it shouldn't come back. Something with the morning wake-up and getting fluid circulated but why? Maybe its low or toasted fluid?? And that's why it's heading to a specialist with a lift and I'll get an answer. At least I'll have fluid checked. And if a change will resolve this its getting done right by someone who works on these cars with the correct fluid. I can use mine in my Fusion so nothing lost.

I see lots of people have lots of miles on these cars and my biggest question is how? How'd my car get to 100k and I can't get another 200 miles on it without it pulling all sorts of crap. Of course the previous 500 miles was just delightful with losing the tensioners and getting stranded. Is there a 100k self destruction mode I'm not aware of???

All that aside what about the waterpump? Just when did they start using better plastic impellers? I wonder what I have? The gernade? I'll do a separate thread on that.

Rtp

 

When these cars were first manufactured there was a war between the Jaguar
engineers and the Jaguar bean counters. Jaguar leadership wanted the latest,
greatest technology, but the bean counters were afraid of how much of that cost
would be reflected in the sticker price. The end result was a compromise that
is reflected in the longevity of many critical electrical systems. Routine maintenance
addresses many concerns, but the root issue of electrical degradation is apparent
in many forum members postings. That said...I have a Sony Trinitron purchased in
1975 that still works flawlessly....but it doesn't have to go out in the weather.

 

"Is there a 100k self destruction mode I'm not aware of???"

Now, aware you are
jaguar planted quite few traps within, but you are on the right track to have them solved, after that it is pure joy to own.
p0715 seems to refer to gearbox speed sensor failure, easy to do with the pan dropped, which you will at oil change
p1647 oxy sensor failure, it is a bit of adventure to replace, but not the worst job either

 

Its an adventure for sure!!! Luckily I'm not relying on this car. I may need to dig a pit so I can get to things. Worst case it could be dug deeper and wider should I need to bury either myself or the car. Depends on which gives out first.

 

That p1647 code. The place i went to and ran from said about $1300 to fix. 😆 🤣 and they said it with a straight face! $635 for fluid and filter change. Obviously neither is gonna happen but I was curious to what I would be expecting as a mere mortal at their mercy. They were honest about it. Said they would want to look at it unless I was ready to drop 5k for another transmission since they don't work on trannys.

 

p1647 - Denso o2 sensor goes for about 50$ on rockauto, it is recommended to change both, so 100
It is 1hr job if approached from under instead from the top as per jaguar manual
p0715 - get yourself multimeter and test the harness from the module all the way down to gearbox, it may be harness from module to box or harness inside the box or the sensor itself, harness inside the box costs about 100, sensor used maybe 20, you need to add cost of fluid gasket and filter cause you aren't putting back old fluid, fluid 50, filtran filter 30 gasket some spare change
I put mine on blocks of wood of about 7" height, it is about enough space to work under the car without issues

 

The downstream o2 maybe but not upstream. Add about $200 to that price

 

you are right, i've missed digits and totally forgot that newer models got up and downstream, mine doesn't
if price is an issue get used set from junkyard or ebay, it should be fine