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Old Aug 21, 2010 | 10:14 PM
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Big Will_
Borg Warner EFR Equipped!
 
Joined: Apr 2005
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From: In the unit, building a 450bhp Time Attack Focus!
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They've all got them - don't worry about it

I believe its part of the ECU monitoring engine bay temperatures to switch between low and high speed cooling fans.
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