1996 850 NA Replace Front Oxygen Sensor P0133

[454cid]

I read about how experts watch the voltage from the O2 sensors in their scan tools in order to determine
if there is anything wrong with them. I know nothing about how to do this and was wondering if there's a
video anywhere showing what to look for and how to diagnose problems with O2 sensors.

Search through this guys videos. He's got some good ones on this.

https://www.youtube.com/channel/UCnIQ-_ ... 8f23dQQHUg

I use the 850OBD2 app, to watch/graph the sensors, but I don't know if it's catching everything. I have no idea what the limits of Bluetooth or my phone are.

[PeteB]

@454cid thanks for that tip.

Here's part 1:


And 2:

[PeteB]

OK, we brought the car in to have the pipe behind the cat welded and they put in the O2 sensor.
Then, we got another exhaust leak and the code came back, I assumed it was caused by the leak.

I finally found the leak, patched it, cleared the code, and the P0133 came back but there is no
new leak it is not loud.

Just to recap, the front O2 sensor is a few months old, the exhaust is quiet but P0133 came back.
I guess that I have to use our scan tool to try and figure this out.
It's possible that the rear O2 needs to be replaced, not sure.