I had my 2001 Dakota for about 45 minutes (bought used) when the check engine light came on. I reset it and it came back on showing the O2 sensors. Before I could get them ordered and replaced all 4 errored. I replaced both S2 but they didn't clear. Both S1 cleared. I posted here and found out that my 4.7 doesn't like anything but Bosch so I replaced both S2 and only B2S2 cleared. I swapped them to see if it was a bad sensor but B1S2 still errored. So do I have a wiring problem or a computer issue? What do I do next? I know you don't know the issue but what would be your guess or suggestion?

Thanks
Reid

 

My guess is that you may do better to post this in the 2nd Gen subforum.

After that, I'd be using a monitor to see what the O2 actually is doing. Sensor 2 is the downstream sensor; that could be a bad cat, since that's what it's actually monitoring.

For the monitor, I'd look at a generic ELM327 bluetooth OBDII adapter, and something like Torque Free on an Android phone.

RwP