Trust scanmaster 02 millivolts or powerlogger ecm afr?

[Black Power]

My wideband is acting strangely, it stays on 14.8 at all times when I am driving. I guess the sensor is going out

Anyway, trying to tune this car, the powerlogger shows my ecm afr is down in the 8:1 range, but the 02 millivolts on the log show that it's in the high 700s and low 800s.

Which do I trust?

 

[esinger]

Ignore the ECM AFR, it's what the ECM is commanding and does not reflect the actual AFR. The WB AFR is what you need to look at.

Powerlogger readings explained by Eric Marshall - Full Throttle Speed Tech Support

If the WB's not moving from 14.8 then the sensor is toast. If you're running a Innovate LC-1 then you can get a new WB sensor for about $52 at a local auto parts store. Use bosch part 17014.