Hi everybody, this is the situation with my '02 2.5V6 AWD XType, check engine on and Abs on.
Check engine because of front upstream sensor and Abs is misbehaving.
I replaced o2 with Dense replacement, had to rewire and use the old jack, but it seems that's not good.
And for Abs, I replaced both bearings and wheel speed sensor (front) and Abs is still turning on. BTW it happens that I start cold, no Abs light, everything works just fine, when a car heats up, boom, Abs is back online.
Any advice? Suggestions? Thanks in advance. I'll attach a diagnosis health report.

 

Can't you just do what others generally do - fit the right O2? They come with the right connector.

 

I have an idea for your ABS issue, especially as you have an intermittent ABS issue - which sounds like an intermittent contact...:
https://www.jaguarforums.com/forum/x...rosion-271898/

Also read my added posts lower down in that thread, not just the initial post in there.

 

Thank you for advice, I've read that post, @Peter_of_Australia is an absolute champion.
His explanation followed up with pictures is the most comprehensive solution for this problem that I have ever seen.

 

Of course i could do that, but, it's price over here is around 150€ and i have to order it and wait for it, and this Denso which is (by serial no.) direct fit, except for the connector, costs around 40€, and i bought it the same day. BTW the store that sold me the part deals in Jag/Land Rover parts. Bear in mind that I bought 2003 Xtype for parts for 500€. Whole thing 3.0V6.
You can understand my problem. I am a cheap *******. 😁
Joking asside, i will measure this one, maybe exchange the part but in the end, i will have to acquire original part. I was thinking about 4 sensors for 100€ of Ebay or Ali, with connectors. Do you have experience with those?

 

Asian sensors never work, period

 

Well, not for long, anyway, Dell. Just replace them with Denso high quality parts. You'll likely never have to do it again.

 

Issues with wheel sensors as well ?

 

Have never bought a wheel sensor, but after the saga of my replacing the right rear hub (see my thread), I now have a Right Rear sensor fault. So.....

 

I just replaced the two front and rt rear ABS sensors, computer said left front and rt rear were bad so I just replaced both fronts and the rt rear. Still have an ABS light so I'll check the read out tomorrow. These were not Bosch, I believe ASIN. I may just purchase new Bosch sensors.

I still have an engine light and a brake booster issue. I have replaced the brake booster hose, the intake "accordion" hose and I have sprayed around looking for a vacuum leak. No luck. Brake is hard to push until car warms up for a minute or so. I seems to be a vacuum leak, somewhere. I have a new Bosch brake booster on the shelf if push comes to shove. The car also is due for tires. Almost down to the wear bars with only 26,000 miles on them. These are the DW06's and I believe have a 45,000-50,000 wear guarantee, Car is pampered so I can't figure that out, I'll call the tire rack tomorrow and see. Got to love it.

 

You haven't read my first post, thats the problem, I did buy Denso replacment, still no luck..

 

Which O2?

Maybe replaced wrong one? What was the code?

Maybe wrong Denso?

 

Actually i don't think it's wrong one, the store that sold me the Denso replacement deals in Jag/Land Rover parts, they searched by code no.
I was in garage today, and measured resistance on all 4 with multimeter, the only one that is "dead" is the lower one on bank 2. I will replace this one and then see what's happening.
Maybe my diag was giving wrong code and pointed to upper o2, but when I measured it, it was fine.
I'll update you guys.

 

Well, you did say you fitted a "Dense" one. That very well could've been a Chinese clone. Anyway the correct Denso one will come fully wired with the right connectors. If you are not an experienced auto electrician, I would not try wiring them myself. Too easy to stuff up. Good luck with finding the right information and repairing it.

 

I'm sorry it was a mistype, it is an original Denso product, it comes without connector, and ellectrician wired it, 4 wires (2 black+Blue+White) bsically you can't get it wrong. Anyway, I measured them all, they all look good except for the lower bank 2 o2 sensor (i replaced the upper one which was also dead). We'll see. Thanks!

 

I replaced the lower o2 sensor, works fine, no errors, but there is still P1647 eroor, upstream bank 2 sensor also installed new, but it seems that ecu doesn't get reading from it. I attached the report.
Only thing I can think of is that connection between connector and ecu is damaged, because when i measure the sensor itself it gives ok readings.
Please guys take a look at this diag report, meanwhile i will try to find out why ecu doesn't get the information from o2 sensor [new one].

 

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Ok, this is my last post about this issue, i don't wanna bother anyone including myself with it anymore.
I dismantled all of the connections, on the sensor itself, connector under the inner lining plastic, cleaned it, sprayed it with contact spray, connections weren't that bad, little dusty maybe.
I just didn't have the time or the patience to go to ABS computer pins and that connection.
Erased errors, everything fine, all sensors reporting same speed, everything works (See attached).
Then i turn the car off, let it sit for a while, turned it on and there they are! Errors for both front wheel sensors, of course abs error on dash and everything with it. I just dont get, what happened while the car was off. How can everything be working perfectly in one moment and go to hell the next. Any advice would be greatly appreciated.

 

Well, as I wrote before: I had the exact same issue. I have sent you the link. It was one of the pins in the big blue connector going to the ABS module. It is very easily removed, just need to know that the big black lever needs to be lifted first, then you can pull the blue connector. Problem is that you will probably not be able to "see" a fault, because that intermittent fault is just not visible. I also added the info in my thread regarding which pin goes to which sensor (info came from electric diagram). As I wrote in my link: Measure at least all the pin-pairs (each two pins to each sensor) and see, it they have those approx. 700 Ohm. But even if, that will not tell you about the intermittent contact issue between any pin on the blue connector and the opposing part on the ABS module. Somehow I found my fault anyway. But I have to note that the source of the problem could even be worse (sit deeper) as it was on my Jag: It would be a cold weld contact on the PCB of the ABS module, and getting hold of this is really no fun...

 

First of all let me congratulate you on that post regarding ABS issue. You saved a lot of jags with it! Thank you.
I read / studied your post, and i followed the lines and connections all the way to the abs ecu, i stopped there, because i wasn't confident enough to go poke in that delphi connector.
I will probably visit a friend who is an electronic genius with your data it shouldn't be that hard for us to figure out this.
Anyway, I am sure that front left sensor connection is bugging out the ecu, it was always that side, so I'll just follow your schematic to the pin for FL sensor and see whats happening.
Thank you once more for sharing this. My next update will be when i solve it, I hope!

 

This is the situation, I resolved the o2 sensor situation, it was my mistake I trusted the guys selling car parts and their catalogs.
Simple as this, it's the wrong sensor.
ABS is still on, i've cheked everything, follow@Peter_of_Australia guide to the letter, connections to Abs central is good, wiring is good.
Only thing left to do is to try another ABS central.
These are the pictures of my wiring and abs central.
BTW the symptoms are: abs on at starting of the car, like cpu can't determine if sensor is there. I turn off the car, turn it back on, abs is off and stays off. Looking at the graphs, all 4 sensors working perfectly.