I have a 96 XK8 which I am replacing both catalytic convertors on. This of course leads to replacing the 2 upstream O2 sensors as they are just old. There are only the 2 upstream sensors. Now I spoke to a Jaguar parts rep. in Ipswich today and I asked him if the sensors that are OEM on my car at present were either wide band or regular O2 sensors and all he could tell me was that they were heated from his parts catalogue.
Can anybody shed some light on this? Are they wideband or is wideband the same as heated or just regular O2 sensors what?
Thanks in advance.

 

The (2) upstream sensors are heated wideband sensors. The (2) downstream sensors are the earlier type narrow-band sensors. They work differently, so they cannot be interchanged.

 

Great, so the heated sensors are the wideband and I take that would mean the downstream sensors are not heated? Thank you fmertz.

 

They are all heated. The electrical manual is available on jagrepair.com if you are curious.

 

You may well find that you don't have any (mine doesn't) and their location on the cat outlet is just blanked. Seems to be North America cars do & rest of world do not (early MY), although the part #s are the same in JEPC.

Just curious - what is wrong with the cats? Are they blocked, or are emissions too high?

 

Ok thanks, So from what I have read on the jaguarrepair.com ( see below ) about this, am I right in thinking that a universal heated oxygen sensor won't work in the upstream for fueling control as it is a narrow band? From what I can work out it looks like I need the HEGO and not the UHEGO? Any guidance is much apreciated.
here's the specs from jaguarrepair.com below
Conventional (HEGO) Oxyegn Sensors
Bank1 - Sensor 1 O2S11
Bank2 - Sensor 1 O2S11
Voltage output of Upstream ( first) Exhaust Oxygen Sensor. Vaires between .2v and.8v normally. Used mainly for fueling control, air/fuel ratio and emisions monitoring.
Universal (UHEGO) Oxygen Sensors
Bank1 - Sensor 1 WO2S11
Bank2 - Sensor 1 WO2S11
ECM monitors the current, positive or negative, needed to drive the operation of the sensor in response to the exhaust oxyegn content, and reports that value. Positive amps indicate a lean system and negative amps indicate a rich system.

 

It sound like one has broken pieces inside when I rev the engine and it is audible on the down rev so I have decided to change both while I'm at it. As they are, they both have 1 upstream sensor on each.

 

The widebands (aka linear) are sensed via current, not voltage.

Cats are expensive so I'd never change one unless necessary and the OE ones are high quality so last well (given proper fuelling e.g. no air leaks, clean MAF, any misfires fixed rapidly, working O2 sensors).

 

Update, I have gone ahead and purchased 2 Denso ( DOX- 0430 ) upstream sensors at a reasonable price of 80 each on E-bay. Link below if anyone else was looking for some.
https://www.ebay.co.uk/sch/i.html?_f...RANTY&_sacat=0
I had purchased 2 Bosch sensors but started worring after I discovered they said they could be used upstream or downstream which didn't sound right. All in all got it sorted out now and will return the bosch sensors for a refund. Just didn't want to go ahead and fit the Bosch then discover they weren't right.
Thanks to everyone who replied and helped. Good bunch of folks you Jag lot.

 

Good decision to stick with Denso sensors. Other brands seem to cause too many problems in these cars....

 

Further update to this thread. It turns out the Denso O2 sensors for my 1996 XK8 and male electrical connectors and not the widely accepted female electrical connectors. Anyway Denso no longer make them so I have had to go with Walker brand recommeded by a Jaguar parts dealer.
Also both of my catalytic convertors were shot to pieces..