I have 1996 XJR supercharged 4.0
need to find 02 sensors & how to replace ?

 

Before you were to take the step and cost to replace the O2 sensors perhaps you can troubleshoot with some information as your issue may be something else . Could be as simple as verifying the sensors are connected up correctly as they fit the same type connectors and easily get miswired and crossed .

Do not twist the wires in installation as they are special galvanized wire and brittle .

Bosch and another manufacture have a cheaper connector ready sensor and the X300 has the different titanium sensor other then the common Z sensor so they read differently in that they generate a resistance in the 5.0 volt reference from the ECU before returning as a sensor value . The Z sensor generates it's own voltage from a ground .

 

so right downstream sensor - 6 cyl has 4 =02 sensors?
ok is under car after cat?

 

Located on passenger side of engine just below the manifold?
conflicted want to be sure to get & do the correct sensor

 

US has 4 sensors and other countries have 2

The fwd cats is the reference point as you look from the hood side .

You have to feel and look by hand as they go to the point of insulation .

The fwd most cylinder is the # 1 cylinder on the AJ16 and the # 1 bank is always on the # 1 cylinder . S1 will always be the fwd sensor or upstream and S2 will always be the aft sensor or downstream .

If you look at the print you will see that the ECU side of the connector has the same colored wires with the exception of the 1 sensor value return to the ECU . This is how you verify the correct position hookup ,

 

Which 1 is the suspect sensor ? If you change more then 1 sensor from what I understand the ECU would need to be " reorientated " at the dealer so I personally would not change more then 1 .

 

Check the connectors for corrosion for mine were bad . And clean the return wire shielding grounds along the upper back wall of the rear engine bulkhead , 2 of them .

 

P1127

 

P1127

 

Codes for 96 are on page 121 :

And is not listed , from a generic car point of view I would suspect the heater . You can put a meter on the heater wires on the sensor side of the connector and the different sensors should read about the same resistance . Blue / Pink wire through the White / Green wire . You'll have to reference the opposite side connector to the ECU for the wire colors . All 4 sensor heater wires get there power from the same fuse # 14 / 10 amp RH engine fuse box and are provided a ground in wire pairs ( upstream then downstream ) by the ECU black connector for the 1st minute of so of the engine starting sequence . A weak point of this circuit is the Papa Indy 61 connector corrosion and the ECU connector corrosion both being common .

http://www.jagrepair.com/images/Trai...20-%202000.pdf

 

left side of pic downstream? right side of pic upstream?

 

I found upstream and I saw the 2 downstream about 15 " past heading towards rear. so P1127 is the problem- I just need to figure which one that is??

 

The upper circle is the B2 S2 and on the inboard side of the circle is the B1 S2

The lower circle is the B2 S1

See above edited post # 10

 

A high or low resistance reading through the 4 sensors 2 heater wires would be the bad one as you compare them . Most likely you will see a high resistance ( or open ) as it may be burnt out as that is the common mode of failure .

 

this is so over my head but am learning- I may need to take it to someone who can better understand . love my Jag - its def a learning process

 

Take some time , she'll wait for you to better understand her so she can better say :

Vrom ,,,,,,,,,, Vrom , Vrom ,,,,,,,,,,,,Vrooooooom .

O2 sensors are the most fical part of engine regulation . At this point we're not talking about the sensor feedback values , but just the heaters .



My Mom says I need to take my nap now .

 

are all 02 sensors the same part # ? same item for my 1996 XJR?

 

Yes , from my understanding someone mentioned that the NTK was different lengths . To be on the safe side they are avail at the local auto parts store in a couple of days ordering and you can take your suspect one with you and compare on the counter so you can get a no questions asked whether you used it or not return . Bosch make a connector ready one also # 12379 .

 

so P1127 is a downstream Oxygen sensor so this I believe is the one I need to get -https://www.autozone.com/engine-management/oxygen-sensor/bosch-exact-fit-oxygen-sensor/491474_102074_0_98000

 

Yes , Bosch # 13789 . I was incorrect . There are cheaper sources like the NTK # 25018 at Autozone . None of them I used . Found one at a salvage yard .