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Legion_s550

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Hey Folks!

I'm helping a friend diagnose an issue he's seeing on his mustang.

He has LTH, and getting poor gas mileage, with trims that exceed +30. The wiring harness to the upstream/downstream 02's appear okay, and the rear 02's are unplugged, and the LTH has a plug where the rear 02's would be.

Can you gut check me here, given tuners will no longer disable02 codes, would plugging a rear 02 in, and connecting it to the harness complete the circuit and fix this code?

Thanks
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GregO

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Gotta have the rears O2’s installed and plugged in.
The rear narrowband are necessary for a few reasons.
Front Wideband O2 calibration is one reason.
 
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