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o2 sensor

  1. Secondary O2 Sensor help

    F150 Ecoboost Problems
    Good Morning, So I am having issues with my check engine light coming on but first I will start off by explaining the background on the truck. I purchased the truck used from a dealer with all these mods already on it. It had AFE stage 2 intake, AFE inter cooler, AFE cold side Charge pipe, AFE...