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hi, I have a problem with my 2011 r56 SD, I have all 4 glow plugs error but glow plugs are new and a preheat control unit is also new all fuses are ok, any ideas??
 

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back to basics use a multimeter and find where the voltage ends on that circuit , the glow plug relay controller is controlled with a signal wire from the cars ecu, trouble is after 2010 bmw have made this info harder to gain as part of what they are now doing on all new cars ie all diagnostics is now done inline and is coded out and locked including resetting service lights etc, its not just bmw mini its all EU car makers,, soon the only cars worth buying will be non EU cars, they are doing this to prevent anyone but them working on them on any level,
 
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