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Fiesta mk4 intermittent immobilizer problem

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My 2003 Fiesta sometimes doesn’t start. Doesn’t turn over and returns the 1-3 immobilizer code, meaning the key isn’t recognized or present. I’ve tried with both keys and it doesn’t make a difference. This is generally an issue when it’s rainy and cold. Works if it’s hot. We tried heating the ignition switch/rfid reader with a hair drier, in which case it starts without problems. Has anyone experienced something similar? Please help.

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