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      01-22-2013, 12:57 PM   #6
shivj
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Drives: 2012 F30
Join Date: Jan 2013
Location: WNY

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Not entirely sure on bmw's, but on my s2000 the same lead would be reused and just the sensor at the end replaced. Looking at the previous generation 3 series it is similar, so I imagine the F30 would be as well. However, I have seen that a few people with F30's have had faulty coolant sensors, which were of course replaced by the dealer. That's the only thing that pops into my head regarding the light coming on
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