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Buick Enclave 2011 with P0420 code. Wish I could attach the graph reading of the O2 sensors. Basically, Bank1 O2 Sensor 2 is very choppy moving up and down in voltage compared to Bank 2 O2 Sensor 2, which shows much smoother. I replaced the Bank1 O2 Sensor a week ago. Code comes and goes.
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