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I think you should check your temp sender is working properly. Pull it out and stick it in a pot of water and use a thermometer to measure the water then compare with the ecu talk reading. Do this from cold water then heat it up so you can test the whole range of the sender. Give all the wiring to the sender a good wriggle aswell to check for temp spikes.
My rule of thumb is always assume its an electrical fault until proven otherwise.
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