Thread: Bosch fan(?) unit on driver side front inner fender
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Old May 12, 2010 | 02:04 PM
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rcompart
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From: Chicago, IL
Default Re: Bosch fan(?) unit on driver side front inner fender
It increases the oxygen content to get the cats heated up and running quicker so the engine can go into closed loop. Kinda like EGR only backwards.
 
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