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Thanks for posting about the AFS solution. I have had the same issue with mine.
Interestingly, the sensor looks perfect with 3 gold springs in perfect condition.
I cleaned them somewhat but the light still stays.
Should have measured the resistance, but didn't.
Wondering if I should order the $28 sensor from Amazon. Can you let me know if you just replaced the entire unit and has the AFS issue been put to rest?