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E36 link g4x expansion loom


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If your wideband controller has a seperate analog ground and power ground, then connect the analog ground to the ECU sensor ground on the expansion.  The power ground would just go to a good chassis or engine ground.  

If your wideband controller only has a single ground wire then you dont want to connect it to ecu sensor ground - the best option will be to connect to the engine block which is usually the main ECU ground point.  

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