hin can someone tell me what a tank heater is and where it is located have a 27d9 fault code

2004 BMW 330CI
73,000 MILES
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GENEWASS
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cant clear code was told elecrical malfunction do need location of tank heater
Sep 21, 2012 at 1:00 PM
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KHLOW2008
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What trouble code are you getting?
Sep 21, 2012 at 2:24 PM