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Ignition Amplifier Failure
It is the code for the TPS Throttle position sensor
Fuel Fail 47 Idle speed contol valve - coil 2: Open or short circuit.
coolant temp sensor fault
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.
This means Idle speed control motor (ISC) or valve
Fuel Fail 37 is either a fault with the EGR Valve or its Solenoid
Evaporative canister purge control valve circuit fault
low battery. had battery tested load type. faild replaced battery fix code 29 thank you
Code fuel 1 would indicate Oxygen sensor. A good information source is the Haynes Manual Jaguar XJ6 1988-94. Good luck.
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
o2 sensor fuel too rich