This error has been posted in the past, but none have been my issue. I have been in the process of upgrading my gauges and engine monitoring using PLX Devices sensor monitoring devices using OBDII connection and their modules. Currently installed o2 wideband sensor, Fuel pressure sensor (Oil) and installed Dash Commander with my iPhone. Worked fine for the first 30 days, but now I have a CEL error P2187 system fuel too lean at idle. The o2 Wideband reading was between 14 & 16, but now hits 17.5 or higher throwing the error.
Tried to clear but no joy.
Winston runs fine. No power loss, starting issues etc.
I did check the wideband sensor and tightened it with no affect.
I checked my other o2 sensors for leaks and did not find anything.
Any input is appreciated.

 

I resealed the new Oil Fluid sensor (It was leaking) and inspected the Wideband 02 sensor I installed. Other than some carbon buildup there was nothing remarkable so I just cleaned it.
Still reading 17+ at idle for when off the gas.
I hate to have to take it in for something I should fix.

 

Did you ever find out what the problem was/is?

 

Not really. Still runs high, but I did a reset and complete reinstall/rewire and no check light.