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      12-19-2012, 10:53 PM   #1
Drives: 2010 x5m
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engine light after downpipe installed

had dp and ecu tune with o2 off, now i have check light, read code as u0100: lost counnunication with engine control module/powertrain control module "a" and p0171: system is too lean,, i double check all wire and vacume hose and etc,,, any suggestion?
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      12-21-2012, 12:58 AM   #2
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could be your O2 sensor off?>>
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