Users with MES, Lambda graph reading

[Sweex]

Hello,

I took a graph of my pre and post lambda sensors tonight, I was hoping that someone may be able to help me read them?

I would disregard the post lambda reading as the car has a de-cat with a emulator to stop the MIL coming on.

I just want to make sure that the sensor is operating correctly as it seems to be switching slowly?

Obviously I have cannot attach a .csv file to the thread so I have taken a screenshot. but if you can message me a e-mail address I can send the full graph.
The screenshot was at idle.

Many thanks.

 

[maggers]

Looks fine to me, pre cat sensor should be constantly switching lean/rich just like that. Post cat, if you had standard setup, should be pretty steady but as it is it would mirror the pre cat without your emulator. Good way to check if the cat is working.

 

[Sweex]

Its steady at about .700v but sometimes mirrors the pre cat depending on throttle posistion.

Thank you for your amswer though