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Dash sweep help?

632 Views 2 Replies 2 Participants Last post by  prastupok, 
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I was on another forum and someone i know recommended I join here!
SO!

Maybe someone can help me out. Check engine light was on, so I disconnected the battery for a hard reset, and the light is out but these C-codes still are showing. I had a scan run earlier and they said o2 sensor, but I know more often than not it isn't an o2 sensor.

These were the codes:
41 20
A3 04
-----

Someone help me out?
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Honestly I have no idea where the upstream o2 sensors are on this truck.
I recently had back surgery so it's not exactly easy for me to get underneath right now to look.
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