If I remember right, the air temperature sensor is in the front right bumper. I have noticed that when it is crisp outside, the car runs a little rough. However, when it is warmer, it seems to run just fine. Is there any way to test the sensor to make sure that it is operating properly? The water temperature is operating just fine, although I did have water temperature sensor issues in the past, and it cleared up a lot of issues when I replaced it, so I don't think that is the issue.

 

Intake temp is measured at the elbow between the MAF and the throttle body (interpolating from catalog diagrams -- I don't have an AJ16). Verifying its veracity is easily done through OBDII, such as with an ELM327 and Torque app or similar.

The temp sensor in the left brake duct is for the climate control. Its reading is what pops up when you hit the EXT button. It is also used by the climate computer to determine how to treat outside air and such.

 

Does anyone have the part number and a seller that will cost me less than 153 new?

 

This is what I found but does not look like the original

 

Air conditioning and heater sensor 3.2/4.0/6.0 litre.
Air Temperature Sensor.
LNA7605AB

 

Sorry, confusing title. I am looking for the sensor on the elbow where the MAS is

 

was that a 140 degrees Fahrenheit or Celsius

 

was that a 140 degrees Fahrenheit or Celsius

 

The IAT ( Inlet Air Temp ) sensor for the air that feeds the engine so only operates in the outside atmospheric range of say 0 to 100 degress F

There will be a slight increase after the intercooler cools it back down after compression on the supercharged before intake into the cylinders

The normally aspirated will be at a slight decease in temp as it sucks air into the engine cylinders

So it is not purely adiabatic ( constant temperature ) prosses of getting air to the sensor then on to the cylinders , but close

Off the top of my head the calibration chart ( Jaguar 801s Doc ) is the same for the engine coolant temp sensor but is a different connector ( ? ) so not swappable

This IAT sensor can be covered in guck ( an extension of the throttle body cleaning ) that will bias the reading to be higher than the actual air flow it is measuring and not as change in readings values responsive

The purpose is to slightly " keep " the mixture ( mass to mass ) fuel ratio contsant ( in the ECU computational sense to derive fuel to be delivered / injector pulse width ) as a reference or a starting point ( the temperature changes the air density ( mass / volume ) in this case and not fuel trim " move to " derived from the resulting combustion target 0.0 % from gasses measurement by the O2 sensors

In a catalytic exhaust system , the fuel mass ratio will be slightly O2 rich to be used in the catalytic conversion of gasses to the wanted product so not ideal 14.7 to 1 but more like 14 to 1 .

It's a balancing act

There was a Youtube video on the balancing act or engineering to put it to numbers and get to your target ( exhuast and engine work production / regulation )

But then the MAF measures mass per time flow

Probably a better and correct way to explain it

LHE1602AA which is a different part # that Bob ( Motorcarman ) came up with , but he would know more than !

And yes it is close to the MAF part #

Genuine Air Box-air Flow Meter-3.2/4.0 Litre (less 6.0 Litre) For Jaguar Xj 1995 - 1997 (from 720125 To 812255) (x300) Classic | Jaguar Land Rover Classic Parts

 

LHE1602AA
which i believe is the same as the XJ40/XJS EAC2863

the part number motorcarman listed was for the incorrect part.
it is for the ambient air temp sensor that sits in the LH brake duct