As your Freelander 1 is able to drive in numerours forward gears, change gear, display correct gear status... then the issue can only be in the electrical wiring harness to the auto gearbox which includes the barrel connectors. You need to check the barrel connectors. The resistance test will confirm the fault. It may be a solenoid itself but that woiuld be real bad luck if you've just had them replaced. It is unlikely as the fault is intermittent. Unfortunatley it may be the connection to the solenoid (the actual wire connecting to the solenoid being lose) itself which requires the front solenoid panel removed to get to it. This wiring is still part of the electrical wiring harness but sadly you can't see it without the cover removed. Hence performing the resistance test to check the electrical connections without taking the solenoid panel off.
What don't the gears do properly when the engine is cold as opposed to warm? F4 flashing isn't caused by oil. It's electrical.
How? The jatco used in the FL1 doesn't know what it's fluid level is. It has no safety check to disable vehicle movement if it's low like on more modern vehicles. It will happily slam gears when changing if the oil level is low without warning of a fault. For you to see F4 flashing there must have been something else wrong at the same time electrically.
Search for TS Auto's who were a gear box repair specialist. I think he's not far from you. He was around on the rover forums some years ago and knows about the jatco auto. He can repair and take them apart. Can't search at the moment. Failing that Ashcroft Transmission are the no1 on jatco and will suply a replacement fully reconditionned/tested auto. Also have fitters in Luton. Bit far but you get it fixed for good. Need to go but will comment later.
That's an interesting fault. It will normally flash F4 for electrical problems like open circuit sensor but it can also do the same if a sensor reading is considered out of range in comparison to what it is currently reading from others. In this situation it doesn't know if it's the sensor itself is at fault or the value measured is wrong because the auto isn't functioning correctly like running at half speed half way through the chain of power. I think this would be the case in the situation you had. Like knowing the revs of the shaft into the auto but sensors further on read different to what it would expect. The auto's computer monitors feasibility of signals for comparison which would cause it to think something's wrong then enter limp with F4 flashing. It's a shame mine didn't do this when the dealer told me to drive it and see how it goes, knowing it was leaking. They knew I wasn't aware of the leak so it trashed the torque convertor. I'm still bitter about this.
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