Need help P1131

[lou1799]

my car is running really lean and it feels like its misfiring i just changed the plugs i put autolites in and changed my oil like 100 miles ago with mobile i dont kno why its running so lean .. i have sniper delta tunnning and im kinda new with the tuner is their a way to change it to more richer mixture..

please someone let me kno what you think

thankss

 

[mrmustangman357]

is it running in closed loop when it warms up?

 

[lou1799]

yeah its running in closed loop i just figured out that the upstream o2 sensor not reading any lean or rich mixture from my scan tool on that bank so i think my o2 sensor is bad im going to replace it cause their is some damage wire