bledy sprawdzisz przez OBD (wiec na desce), przez wtyczke potrzebujesz stary system JDS (jaguar diagnostic system)
albo konwertora. kode w xj40 nie sa uniwersalny tak jak w x300 albo nowszych niestety.
fail 16 Air thermistor: Resistance out of range
Fuel Fail 16 : intake air temp sensor out of range    by Brett Gazdzinsky
    Conditions for flagging : signal to ECM under .1 or over 4.9 volts for 69 milliseconds. Default setting 86F if FF 16 is flagged.
    Possible faults :
        Dirty connection at air temp sensor,
        High resistance or short between air temp sensor and ecu,
        Bad intake air temp sensor.
    The intake air temp sensors function is to retard the ignition timing during intake air temp rise to prevent detonation. The intake air temp sensor resistance reads he same as the coolant  temp sensor.
        14F  9200 ohms
        32F  5900 ohms
        50F  3700 ohms
        68F  2500 ohms
        86F  1700 ohms
        104F 1180 ohms
        122F 840 ohms
        140F 600 ohms
        158F 435 ohms
        176F 325 ohms
        193F 250 ohms
        212F 190 ohms
    At high engine loads, the air intake temp sensor retards the timing 2.25 degrees every 10C above 86F (30C), at light loads, it retards the timing starting at a higher temperature. It has NO effect on mixture.
    The intake air temp sensor is located on the top of the elbow.