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Old 05-04-2021, 09:28 PM   #7
Board Member
Join Date: Jun 2018
Location: Lafayette, CO

I just went through a lot of misery trying to figure this out myself, my AFR was bouncing all over the place as I had the black wire connected to the MS sensor ground and the white wire running to a ground near the main MS ground. This is one of the rare occasions where you need to ignore the MS documentation mantra of grounding all of the sensors to the MS sensor ground.

Black wire to where the MS is grounded, white wire to some separate chassis ground point. Do NOT use the MS sensor ground wire.
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