I don't know if the wiring is correct but I guess it was OK as it looks like the pump looked original.

I changed the thermostat a few months back but that said, during this saga the temperature gauge, on occasion, would stay at cold accompanied by the fan being fully engaged. Again with no relevant errors, clearing 'all faults' anyway the fan speed reduces to normal and the temperature gauge indicates normal. . . Range Rover 4.2 SC
2 Range Rover Classics - one from new but both rusty now.
Rover 3.5 Coupe had since new.
Subaru Legacy 3.0.
BMW K1200RS.

Did you do both temp sensors? As in the one under the car by the oil filter? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Hi,

I haven't touched any sensor. How would I test them? Range Rover 4.2 SC
2 Range Rover Classics - one from new but both rusty now.
Rover 3.5 Coupe had since new.
Subaru Legacy 3.0.
BMW K1200RS.

I’m not sure tbh they weren’t too dear so just changed them Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

I changed the coolant temperature sensor - no change. Cleaned the MAS - no change and ordered a new one but hasn't arrived as yet.
Finally gave up and called the RAC and they worked on for over two hours (including 30mins calling their tech) and couldn't fix it so it was transported to LR on Friday and they'll start working on it hopefully on Wednesday. Range Rover 4.2 SC
2 Range Rover Classics - one from new but both rusty now.
Rover 3.5 Coupe had since new.
Subaru Legacy 3.0.
BMW K1200RS.

Oh dear hopefully it won’t be too painful - keep us updated! Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

It's fixed.

It was one of the cats which had collapsed internally and was virtually blocked. Range Rover 4.2 SC
2 Range Rover Classics - one from new but both rusty now.
Rover 3.5 Coupe had since new.
Subaru Legacy 3.0.
BMW K1200RS.

i had that too but caught it early - did you go genuine or aftermarket? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Had to go genuine. Picking it up this afternoon.
Apparently the 'misfire on cylinder 5' is some kind of catchall for a pending 'get yer wallet out' quite often. . . Range Rover 4.2 SC
2 Range Rover Classics - one from new but both rusty now.
Rover 3.5 Coupe had since new.
Subaru Legacy 3.0.
BMW K1200RS.