O2 sensor codes 21 and 5 (1 Viewer)

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Joined
Jan 10, 2025
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Location
Victoria
Hi guys,
My 1993 80 series has been having o2 sensor issues, its throwing codes, 21 and 5. Ive replaced the old o2 with a new one from online auto parts and it hasnt fixed the issue.
Im getting 12v to ox1 on the diagnosis board when from what i know its ment to be between 0.9-0.1v.
For a bit of info on the car, it used to run on gas, ive ripped the tank and lines out but all the wiring is still there. Ive heard that could cause issues but im not sure.
I have done the engine light reset and the codes still come on. And its an aus 80 series so only 1 o2 sensor. This is my first post so sorry if this info is elsewhere

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