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AFX wideband wiring + earthing question

Josh T

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how is everyone wiring up their AFX widebands on an extreme? Iv had troubles in the past with it being slightly offset. The manual says to wire the two ground wires and the sensor ground wire to the battery ground. Why would they not wire the sensor reference ground to the ecu sensor ground input? On an unrelated question im wiring up an extreme into an evo 9 using the factory harness, the factory harness only has 2 ecu/power earths. Do I need to wire up all 4 in both the A plug and B plug or are the all tied up internally so I can just put both in the A plug and leave the B plug without earths or should I splice into the two and make them 4? cheers 

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