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.
Fuel Fail 47 Idle speed contol valve - coil 2: Open or short circuit.
It is the code for the TPS Throttle position sensor
This means Idle speed control motor (ISC) or valve
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 37 is either a fault with the EGR Valve or its Solenoid
Evaporative canister purge control valve circuit fault
The fuel pump is in the fuel tank.
low battery. had battery tested load type. faild replaced battery fix code 29 thank you
Ignition Amplifier Failure
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
code42
Fault code FF17 on a 1993 Jaguar XJS typically indicates an issue with the engine management system, specifically related to the fuel mixture or oxygen sensor readings. This code often points to a problem with the air-fuel ratio, which can affect engine performance and emissions. It’s advisable to check the oxygen sensors and the fuel injection system to diagnose and resolve the issue. Always refer to the vehicle’s service manual for specific troubleshooting steps.