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OK, got some data.
OBD Fusion only shows 2 O2 sensors. I assume these are the two pre-cats:
Both usually are pretty close to each other, but sensor 1 will drop close to 0 while sensor 2 shows around 0.75 at idle, then rebound. On accel both show around 0.75, and on decel both drop to 0.
Does that point to anything?
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2001 E53 M54 5MT Oxford green over crusty black leather 206,000mi 2002 E46 M54 2.5 5MT silver over black sensatec 217,000mi
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