Oxygen Sensor Data

[zibzer]

Hello, i just bought this new gadget that shows data from the OBD2 port. I need help determining if ! have 2 bad sensors or if this is normal.

 

Bank1 Sensor1 - Very erratic

Bank1 Sensor2 - steady

Bank2 Sensor1 - Very erratic

Bank2 Sensor2 - steady

 

 

Let me know what you think! no codes being thrown. I do have a slightly rough idle though.. but this could be many things

[5829BMG]

I think it's normal. Ask the tech might be a better section to post this

[zibzer]

ok, if a Mod can move this to "ask the tech" id appreciate it ! thanks

[dewfpo]

That data looks normal to me. The pre cat O2's are supposed to move around as they are always feeding live data to the ECM so it can keep the AFR optimal per the fuel map. The second O2's are post cat and are just making sure the Cat's are working properly. No worries.

 

DEWFPO

[Wires]

That data looks normal to me. The pre cat O2's are supposed to move around as they are always feeding live data to the ECM so it can keep the AFR optimal per the fuel map. The second O2's are post cat and are just making sure the Cat's are working properly. No worries.

 

DEWFPO

 

 

+1 The pre-cats oscillate up and down (the ECM makes it lean, when it goes too lean, then it richens it up, and so forth). So they should look like a SINE wave. Post cats shouldn't have any O2, so they are typically close to flatline.