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I bought a 2013 mustang GT used about 2 years ago, I had to take it into emissions and had the car sit for around 2 months prior. I had to jump it and perform multiple drive cycles. I couldn’t get the O2 and O2 heater sensor to turn on. I had it tuned but wasn’t completely sure of the base tune on it, so I took it to Ford for a ECU reflash to stock. Drove it for about a week and still can’t get those sensors, it takes a while but the catalytic sensors turn on. Any ideas what this might be?
 

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IMHO, time to get out the diagnostic tools and check for 1) are the sensors good, 2) is the wiring/connectors good..... then go from there
 
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IMHO, time to get out the diagnostic tools and check for 1) are the sensors good, 2) is the wiring/connectors good..... then go from there
Sorry should’ve included that info. My scanner that I’m using doesn’t show live data so I might need one that does. But I used the multimeter for the downstream sensors and they seem to output the right voltage. From what I can see the entire exhaust system is stock except the axel back mufflers I put on.
 

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Sorry should’ve included that info. My scanner that I’m using doesn’t show live data so I might need one that does. But I used the multimeter for the downstream sensors and they seem to output the right voltage. From what I can see the entire exhaust system is stock except the axel back mufflers I put on.
You can do this with a multi-meter
 
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