I don't have an actual photo to make this clearer, but I noticed that up under the XJR6 intercooler (item 1 in the diagram) is an electrical sensor. It is mounted midway along the closest long edge to the intake ports.

I assume this sensor is for measuring intercooler water temperature or perhaps intake post-supercharger pressure?? Anyone know?

Just curious really.

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Ok, here are some photos for reference. I want to get this all put back together next weekend, and have concerns this sensor may be compromised due to all the oil in the intercooler, so need to order it very soon.

Can anyone identify this sensor? I haven't found it in the various diagrams at Jaguar Classic Parts yet.

BTW, it doesn't pierce the water jacket in the intercooler, and instead is exposed into and sensing either the pressure or temperature of the air charge in the manifold. Not sure which.

 

I'll also be curious of the torque and if thread lock is required when reinstalling if anyone knows. I suspect it would be the same as the coolant temperature sender that is installed in the thermostat housing.

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It's an intake air temperature sensor.

On the naturally aspirated engines it's located in the intake elbow.

In the supercharged engines it's in the location of your pictures.

p/n LHE1602AAI believe

 

Here is a picture of the Air Temperature Sensor LHE1602AA (Item 7), possibly showing a non-supercharged engine.




The sensor is still available from British Parts and David Manners, for about GBP10.

 

Excellent, thanks!

https://www.jaguarclassicparts.com/uk/part/LHE1602AA

This seems to be marginally "unobtanium" as I'm having a hard time finding one anywhere in the USA. There are tons of the previous version of the part, but not this one... weird. But I'll keep looking. I have a call into Terry's Jaguar.

I have no idea if mine is bad, but it is completely gummed up in old oil, and it's now been soaked in water, degreaser and carb cleaner, so have no idea if it is(or was) in good working order, or how to test.


BTW, do you know the installation specs for the sensor, such as torque and if any sealer is required or if the sealing washer (8) is required to be replaced at the same time?

I'll see if I can find it in the service manual in the meantime too.


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No idea. I suppose it is just another ordinary temperature sensor with a washer that should be hand-screwed on until it is tight?

 

I've got one expedited on the way from GB, none were in the US. I had Terry's Jag look, but the part is NLA.

I'll look in the service manual for specs to install the water temp sensor. It should be the same.

 

I found one from:

Jaguar X300, XJS Air Temperature Sensor (LHE1602AA-O) - JustJagsUK.com


They were really great to work with, and had it to my doorstep in the US from the UK in three days relatively cheaply.

The service manual seems to call this an "Intake Air Temperature Sensor" (IATS), although it also references an "Intake Air Temperature Sensor Ignition" that says it uses intake air temperature to retard ignition when high intake temperatures are sensed. So I'm not sure which is correct for the XJR6 part.

I found a line in the service manual that specifies 7-9 Nm of torque for the "Air temperature sensor to air box"


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I just bought my from the dealership for $200. The new part number is LCC1602AA. It does not show up in the exploded diagrams. As a result, it took the dealership a long time to figure this out through deductive reasoning. And I agree, no one else has it for such a common part!

 

This is a flow diagram for the AJ16 SC which shows the EGR temp sensor after the impellers . Never mind the ECT sensor as this pic was for someone else .

 

Holy moly.... $200!?

The part is still available at the link above from when I bought it last year. It is still only £10.50

Jaguar X300, XJS Air Temperature Sensor (LHE1602AA-O) - JustJagsUK.com

I assume that your $200 sensor is genuine Jaguar, and the one at JustJagsUK is aftermarket given the huge price difference.


It's really odd that Jaguar put this sensor on the underside of the intercooler. It's nearly impossible to reach without removing the intercooler & intake, and it gets covered in any oil blow-by. It seems like it would have been better served to mount on top of the intercooler. Ah well, alas....

 

The diagram helpfully provided by Lady Penelope is incorrect regarding the location of the IATS (Intake Air Temperature Sensor). In the diagram it is shown upstream of the throttle. This is correct for naturally aspirated engines. However, for the supercharged engine it is mounted, as shown in Al's photograph, on the downstream side of the intercooler. In this location it can measure the temperature of the air that is actually entering the engine.

Al, if you want to know if the IATS is working, plug it into the harness, turn the ignition on (remove both of the fuel pump relays, if you have dismantled the fuel rail to remove the intercooler) and monitor the air temp with an OBD scanner. If it reads ambient air temperature then the sensor is probably OK.

 

Editing

 

So, I think it would be a good idea to fully explain my situation, in case someone out there has ran into a similar problem to mine and my get some insight to resolve their issue. Also it is how I got to the Intake Air Temperature Sensor.

It started a couple months ago when my XJR threw a CEL at me. Putting an OBD II scanner on it, I got the following codes. P0172 (System too rich, bank 1) and P0175 (System too rich, bank 2). I finally fixed the problem, but not after going through a list of fixes till the CEL finally went out. Being a FIY person, I chose not to take it to the mechanic, but rather do it myself, for I had this problem before and just cleaned the MAF sensor and it was good to go. But not this time. I did not realize the frustrations that would happen in the following weeks. It continued to throw P0172 and/or P0175 codes at me. Below is what I did in chronological order along with costs:

1. Cleaned MAF sensor ($7 MAF sensor cleaner, Autozone)
2. Reconnected vacuum line to MAP sensor (No cost)
3. Replaced MAF sensor with new ($240 from Napa Auto Parts)
4. Replaced MAP sensor with new ($116 from Napa Auto Parts)
5. Cleaned Throttle Body ($6 Throttle body cleaner, Autozone)
6. Replaced coolant temperature sensor with new ($20 from Autozone)
7. Replace Intake Air Temperature Sensor with new ($196 for Jaguar Dealership, I had actually had actually sneaked a look when the parts guy went to the stock room and saw it on their computer system for $118, but I got charged $196 in the end!) See attached photos below. The IATS on the XJR is located on the passenger side intercooler at the rear. It is easy to get to after removing the plastic air intake duct. Below the IATS is the fuel regulator and that would be item #8 per below if that came next. Also attached are photos of the new and old IATS, plus packaging it came in.

My problem was finally fixed and no more CEL. However, if the CEL continued to come on, I would have done the following:

8. Replace Fuel Regulator ($239 from Parts Geek).
9. Replace O2 sensor(s) (from Amazon, Rock Auto, Parts Geek, etc.)
10. Sell the Jag and cry…..

 

XJR Pilot,
Sorry to read about your experience with the Intake Air Temperature Sensor (IATS) on your XJR V8. The rest of this thread related to the corresponding part on the XJR6 engine.