That is due to a scan tool or PCM/sensor issue. If this was a PCM/sensor issue then you should have codes pointing to the o2 sensors.
So that means I suspect you have a scan tool issue that is not able to monitor that data. That is pretty common on generic scan tools. Do you see something in there that says o2 sensor voltage?
If you have the voltage we can get the same info. Basically the o2 sensor will tell the PCM a voltage between.01 and.1 volts. Based on this voltage we can tell if it is rich or lean.
Most all scan tools can get that voltage so let us know about this and we can figure that part of it out. Thanks
Saturday, September 4th, 2021 AT 7:06 PM