F150 Ecoboost Forum banner
emission system
1-1 of 1 Results
  1. F150 Ecoboost Maintenance
    My check engine light recently came on so I took it to a shop to see what caused it. The report I received didn't give a specific code, but instead, said L upper Emission System Oxygen sensor. Does anyone know which side the left sensor is? I know its before the catalytic converter but not sure...
1-1 of 1 Results