Fuel Fail 37 is either a fault with the EGR Valve or its Solenoid
what means fail 44 of vcm of jaguar
Evaporative canister purge control valve circuit fault
fuel 44 is heated oxygen sencer bank A other term lambda senser the jag has two.
it means Pad NOT Pao YOUR BRAKE PADS ARE LOW.
In 1990-1994 XJ6 the VCM Code 44 is the code for the O2 sensor, either rich or lean exhaust has been detected and is causing the code to trigger. It could indicate a bad O2 sensor.
I own a 91' XJ6 also and i believe when that code comes up it is as simple as your gas cap not being on all the way
Idle speed control valve coil 1 fault. Off voltage not less than 0.85 volts or on voltage not exceeding 12.25 volts.
The Haynes manual says an error code 69 is a neutral safety switch circuit / Engine cranks in drive (adjust or replace switch). Note: the Shift cable for the Automatic Transmission stretches over time and should be adjust, if too long cable will need to be replaced.
a problem with the throttle potentiometer
Code fuel 1 would indicate Oxygen sensor. A good information source is the Haynes Manual Jaguar XJ6 1988-94. Good luck.
JAGUAR vehicles obd1 code retrieval For Jaguar vehicles with obd1 codes (made before 1995 or 1993), testing the check engine lights in your dash to get the code is simple. All you do is locate the Vehicle Condition Monitor (VCM) button in the dash panel sitting below the tachometer and speedometer. The procedure begins by turning the key off and waiting for 5 seconds then turning the ignition key to position 2 without starting the engine. When you press the VCM button, codes will start to display in your dash panel. Clearing the codes can be done by turning the key off and removing the battery negative terminal for 30 seconds and reconnect.http://www.extreme-check-engine-light-codes.com/Jaguar%20OBD1%20Decoder.htm
This indicates a fault with an electrical circuit (such as a blown fuse). On certain models, more information can be got from the Vehicle Condition Monitor (VCM) by pressing the vcm button on the dash.