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I THINK the sensors are two stage. One stage wears to a point where the nanny can calculate the remaining mileage. When the other wears through you get the warning. I'm sure someone else will chime in.
On a new sensor no "filament" is visible.
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Dave
'05 325xi
'10 E70 35d
'85 911 Carrera
'66 911 Work in progress
'91 Chevy C1500
'95 Jeep Cherokee
‘18 Jeep JLU
Last edited by Mackskibum; 04-18-2017 at 10:38 PM.
Reason: Additional detail
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