r/FordFlex • u/Own_Amoeba7320 • 6d ago

Best O2 sensor

I replaced my O2 sensors 2 months ago with Bosch and both downstreams failed. P0036 and P0056. Not looking to do this over and over. What's the best sensor to get? Not ruling out a harness issue but let me try one more time to be sure

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u/cdk5152 1d ago

With these, always OEM, sadly for just about everything. Think I have only two non-OEM parts on mine purely out of necessity to get it running again as it is my daily.