shanec

In trying to debug my infamous longtube header issue with the P0133 code (front passenger slow o2 response), I recorded this among other things:


This is a datalog beginning with cranking the engine and then driving a couple minutes.





Anybody understand o2 voltages? What's it mean when one of the O2's voltage data doesn't swing as low as the other? Notice on both banks, the peaks are about the same. But on bank 1 (driver or passenger?), the troughs (bottom side peaks) don't go as low as bank 2. What's that mean?

moosestang

Aren't the long tubes causing the code?

The fact that the lean swing isn't as low on Bank 1 isn't the problem. I assume the distance between the swings not being as close on bank 1 is the reason for the code. You could always swap out the sensors to rule out a faulting sensor, but I thought this was a common code with long tubes.

jahudso2

Did you use 02 sensor extensions? Is it possible the extension is faulty?

shanec

I used O2 extensions.

I replaced one O2 already. A week later, I get another code for the other O2. Sure I could replace at O2 also. Just hate to throw money at it not knowing of the O2 itself is the problem.

moostang, allegedly longtubes do not cause any problems when the tune is properly adjusted. My tune is supposed to be adjusted, but it looks obvious it needs more adjustment. I'm trying to figure out just what needs to be adjusted Doug@Bama isn't sure.