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Just a guess, but...
...perhaps your idle mixture is too rich?
...catalytic converter is clogged?
...O2 sensor is picking up some chemical byproduct as a result of the plastic bag residue still burning on the cat?
Not sure whether those conditions will send a warning, but it's a thought...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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