Thread: Milltek exhaust available for XR4 (Fiesta ST) - Video!
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Old 25-02-2007, 02:27 AM   #22
Piotr
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Join Date: Oct 2006
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My understanding is because you have changed the air flow through the cat and taken 2 away the computer will display the MIL light because the information its getting from the sensors have changes too much from stock.
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