So I recently installed my turbo kit and AFR gauge on my car, and on startup and normal idle it reads completely lean. I have an AEM UEGO sensor and gauge. I have the gauge set on the P00 setting which is wideband output I have checked all connections and grounds and they all seem fine. Bad sensor maybe?? that's what I'm thinking but I'm looking for advice. The car also seems to idle fine on startup, no smoke out of the exhaust. However once the temp gets up the idle starts to stumble a little bit and still no smoke. I also previously messed with the fuel VE table in Mega-squirt making it put more fuel in the engine but the AFR still read completely lean. Any advice?

 

Spray some brake cleaner on the sensor. See if it goes to rich. Otherwise anythingyou do to the VE is a shot in the dark. My AEM when the sensor died would do a sweep and start at 14 or so then increase to full lean within a few seconds and stay pegged. New sensor resolved this.