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  #11  
Old 08-26-2020, 09:23 AM
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I cleaned the MAF, ran a cycle of Cataclean through it, changed air filter, going to reset and take a pic of the codes if they show back up.
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  #12  
Old 08-26-2020, 07:50 PM
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When’s The last time the rear O2 sensor was changed? That’s usually the one responsible for showing cat inefficiency codes. Look there 1st to make sure it’s operating correctly
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Old 08-26-2020, 09:00 PM
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Ryan, I havent ever changed it. The X5 is a 2010, and I have only had it for a year and a half, P0420 is the current code that comes up within 50 miles of resetting.

Thanks for the replys and suggestions.

Tom M
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  #14  
Old 08-26-2020, 09:09 PM
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If you can do some monitoring of the sensors I would. Or hell, at that age and mileage, just replace both sensors. They are due
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