8/26/20 10:49 p.m.

I have a 2001 3.8l Mustang. Just recently I replaced my upstream O2 sensors because the engine was running rich as all get out. Just wondering what would happen if I unplugged one of my 2 O2 sensors. Would the car just run in a open loop?

Mr_Asa Dork
8/26/20 11:29 p.m.

Open loop with a trouble code, yup.

A1aman New Reader
8/27/20 8:07 a.m.

In reply to Mr_Asa :

Thanks dude, so the ECU does Use both upstream O2 sensors to determine rich/lean mix. Or 1 upstream O2 sensor if the engine has one exhaust pipe? 

Professor_Brap (Forum Supporter)
Professor_Brap (Forum Supporter) SuperDork
8/27/20 8:15 a.m.

In reply to A1aman :

Uses bott upstream. 

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