2013 Ford F150 EcoBoost P0131 Code: O2 Sensor Replacement Not Resolving Issue
I'm experiencing a persistent P0131 diagnostic trouble code on my 2013 Ford F150 EcoBoost. I've already replaced the oxygen sensor, but the code continues to appear. The vehicle is showing symptoms of poor fuel efficiency and rough idle. I'm looking for advice on possible causes—such as wiring issues, exhaust leaks, or sensor voltage discrepancies—and whether there are any specific diagnostic steps recommended for this model year and engine configuration.
What is the actual sensor voltage reading at the O2 sensor location? What does the Powertrain Control Module (PCM) report? Wiring issues or a faulty ground connection could be contributing. Has the problem been resolved previously, and if so, what was the fix? Is there any evidence of an exhaust leak? Can you temporarily adjust the air-fuel mixture to see if the code clears—such as by enriching the fuel mixture under load?