I am having issues with this wideband and wonder if anyone has had a similar issue.

I have the blue wire (heater ground) grounded to a ground block that is shared by the MS (and all sensors) and the green (main ground) and white (analog ground) wire wired to the same block. The block is grounded to the chassis.

At idle the AFR is around 7 and then irratically goes up to 20 and back to 7. The range is set at 10-20.

I originally had all three wire gounded to the chassis with the white and green being at one location and the blue at another but I had the same results.

I am not getting any error codes.