Air Temperature Sensor

1990 XJ-S and 1991 XJ-S Classic Collection Coupes (US Spec, 5.3L V12)



¾” Box Wrench

Air Temperature Sensor (Part Number EAC 2863)


The Air Temperature Sensor (also known as “Air Intake Sensor”) is on the top side of the left-side Air Filter Housing’s “trumpet”.  It took longer to write about it then to change it…


Air Temperature Sensor Location

(Viewed from Left-Side)



The device is a “Thermistor” - a resistor that changes it value as ttemperature changes.  It is used for the EFI system and is easy to test as covered on one of Sean Straw’s web pages (  I got mine from (their part number IN100393) for $22.56.  Unplug the connector (try not to crack it), and use a ¾” box wrench to remove the old one and reinstall the new one.  There is a copper washer there – if it looks in good shape, reuse it, otherwise get a new one.  Plug the connector back on.  Next project…


New Air Temperature Sensor




Questions/comments: Email me.