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Is there any connection to the shift light not working and any component you replaced.
Without a CEL and your mileage has tanked, I would suspect the 02 sensor. Is the 02 sensor OEM or aftermarket. Even the drag of a tire low on air could affect the shift light, but the major loss of mileage without an ignition issue of a CEL points to the sensor (02).
I'm not sure but I would think the ECU would be the source of the shift light signal, based on the input form various sensors, in particular MAP.
regards
Mech
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