Fuel Fail 47 Idle speed contol valve - coil 2: Open or short circuit.
Ignition Amplifier Failure
Fuel Fail 37 is either a fault with the EGR Valve or its Solenoid
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.
Idle speed control valve coil 1 fault. Off voltage not less than 0.85 volts or on voltage not exceeding 12.25 volts.
Fuel fail 39. EGR circuit. Faulty system operation. Is on my 90 xj6 as well- going to take EGR valve off and clean it- see what happens.
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
Evaporative canister purge control valve circuit fault
in the trunk remove the spare tire
On a 1993 XJ6 the fuel filter is bolted to the underside of the car on the nearside near the rear wheel-arch.
fuel 44 is heated oxygen sencer bank A other term lambda senser the jag has two.
The fuel pump relay for a 1993 xj6 Jaguar is located in the trunk on the right hand rear side, next to the rear light control module. It is a 4 prong black relay.