you can't just swap ecu modules. They are coded to the ignition lock's red key and vice versa and it's massively unlikely to be an ECU failure.

interesting to see you have a good start up and run when cold (left overnight / cool down or left for a while after failing to start) which is coupled with a temperature (hot) warning light at the time of failure.

My guess would be your motor has an overheating issue, or a failing temp sensor. Check your cooling circuit / fluid levels / radiator for damage (crash repair) / thermostat accuracy

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