hello - so went to a jaguar indie as had an engine light on. the fault says "P1646: heated oxygen sensor control module, bank 1 open/shorted". luckily my neighbor is an ex mechanic so he can help me change this out.

questions though:
1. which is the correct part? i went on europarts and keyed in my model number and comes up with a Denso Lambda Sensor (front): is that what the error code relates to?
2. is this easy to change? which is bank 1?
3. any one recoommend a good reader to save me the long drive? is the icarsoft one OK?

thank you

_____________
2002 XK8 (added by GGG)

 

I dealt with this just the other week:

what-did-you-work-today-thread-138704/page8/#post1580315

PS: You should really update your "signature" to list the specifics of your car model and year.

 

Here's my experience with the issue...read to the end for the results.

https://www.jaguarforums.com/forum/x...rs-how-149326/

 

Since there is no car info it is very difficult to provide help. The code 1646 has 2 definitions depending on MY and Type. It can be an O2 sensor or a fuel pump relay.
Let us know what the vehicle is you are dealing with.

 

Welcome to the forum londonxk8,

I've added Model & Year details to your post.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

hello all, thank you for the quick replies. i have just read the new member section, and hopefully have my profile correctly updated with a signature and photo of the vehicle now. i also made a quick post to introduce myself.

i'll go through your responses now!

 

i took the car to a Jaguar Indie to have the code read, and the code came up as P1646: heated oygen sensor control module, bank 1 open/shorted.

So, i purchased a Denso Lambda Sensor (Front) - is this the correct part?

Also, I decided to get my own code reader, so purchased an icarsoft i930. i read about all the "approved" code readers in the forum, but most of them are all in the US, and I was keen to get one shipped to the UK soon so i can try and solve this oxygen sensor issue. is the icarsoft decent?

my car is a 4.0 litre, 2002 xk8. sorry, new to the forum and just getting things set up correctly now!

thanks

 

London, you might have jumped in a bit too soon buying that sensor! As Avern1 pointed out, P1646 can be for a Fuel Pump Relay 2 for some years of manufacture and your Model Year 2002 is one of them!

That relay is fitted on the front edge of the fuse box in the boot/trunk. It's in the second position in, from the righthand side looking from the back of the car. You could check by swapping it for another relay inside the trunk fuse box - the rearmost one of the line of relays in line with the car (Not across the car) is for the rear fog lights and would do.

Failure of that relay should normally limit the engine to 3000 RPM

 

hello - thanks for the reply. i did have the code read at a jaguar indie and the code specifically said it was the oxygen sensor - could that be wrong?

also i have been driving the car normally and seems to be driving fine (i dont think i'm limited to 3000 RPMs)..

 

Hi.

From JTIS Code P1646

VIN 001036-018108 no such code
VIN 018109-031303 Fuel pump 2
VIN 031304-A00083 Heated O2 sensor
VIN A00084-A11140 Heated O2 sensor
VIN A11141-A30645 Fuel pump 2
VIN A30646- and on Heated O2 sensor

 

hi oyster, my VIN (the last 6 digits) are A28937. I'm going to seem stupid here, but thats within range: VIN A11141-A30645 Fuel pump 2 - correct?...

i am totally confused now as the jag indie said its the oxygen sensor - is he wrong? or i am being stupid!?

 

Hi again.

Nobody is being stupid. This code (P1646) has caused a lot of confusion earlier in this forum. My information is from JTIS (Jaguar Technical Information Service) which should be correct, but experience has showed that in some rare cases the information could be somewhat inaccurate.

Now, if your car is the non supercharged XK8 as opposed to the supercharged XKR, then you can forget all about fuel pump no. 2 as you only have one fuel pump.

This again means that your indy is correct in that it points to the oxygen sensor or its connectors or wireing.

If you should want more confusion you can do a search for this code in this forum, and you will get lots of diverging information that will destroy your night sleep, which again is a bad idea in this pre Christmas times.

 

Well if Jaguar fouled up the codes like that then FFS. But if right it'll be the pump. For all the other cars (like mine) it's the O2 sensor so your mech would usually be right.

I never saw that table before nor heard of this (if it's right - I dunno).

(BTW at least some of the cars have 2 pumps where on some models one just transfers between tanks but on others - the R ones - it feeds extra to the rails.)

I REALLY would expect a pump NOT to be P1646. Maybe B1646 or C1646, but not P1646. Complete foul up if this isn't so.

I'd be 95% in favour of the mech right now...

Not only that, you can generally use a meter and check the supposed bad O2, compare with the same one on the other bank and see if they're different. If so, it's the O2 so just replace it.

 

hi oyster, unfortunately i have the non-super charged xk8 (i imagine the supercharged version is a dream to drive!).

i'm going to have a play around and look at the connectors and wiring, failing that - will try to install a new Denso Lambda Sensor (Front) - hope this is the right part! i managed to find one on sale this weekend, so was £60 rather than £90ish

i also purchased an autel AL619 EU thanks to a suggestion in another thread - so i'm looking forward to diagnosing my own issues soon!

thank you for the help, i thikn i would lose my sanity reading about P1646 due to all the existing pre-christmas stress you allude to!

thanks again, much appreciated

 

hello - thank you. i''m going to print your posts out and have a look at this with my ex neighbor mechanic - as using a meter woulld be outside my comfort zone but easy for him perhaps! i have a new 02 sensor ready to go so hopefully can get this issue solved!

 

He'll find it trivial except maybe getting to the connectors. Point him to the electrical info e.g. workshop manual or JagRepair.com - Jaguar Repair Information Resource if he wants it.