Replaced both downstream sensors

Question

I replaced both down stream sensors yesterday and light came back on Saturday before it would come on within a couple hr's Any ideas All the car is a 2013 impala LTZ with a 3.6 L

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Answer 1

This is where you have to verify that there is no vacuum leaks that would even affect the  MAF (mass air flow) operation. and check to see if there is any coolant loss the intake manifold coolant seepage has to be inspected for that