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Backstory: I was driving down the highway when check engine light came on. Connected to OBDII and shows a P0430 catalyst System Efficiency Below Threshold bank 2 (driver side). So I replaced downstream O2 sensor and cleared the code. Unfortunately for me it came back 2 days later. Cleared again and came back 1 day later. 2018 expedition max 3.5 ecoboost has about 90,000 miles on it. Seems like an early failure for a catalytic converter. I don’t want to spend the money on a new catalytic converter. Can I drive it like this without damaging the vehicle? Or is there any other cheaper fixes for this? Thanks in advance for the help. -mike
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Burning oil or running rich will ruin the cats at low mileage. Otherwise, no clue.
 
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