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It could, especially if no DTC are being thrown by the driver side O2 sensor. With that said, I still feel the code is being set because the heater is not staying warm enough due to the LT's.
I have the very same issue.. threw the P0155 for the pass side and I have a leak on that collector as well. I dont know for sure if the two are related to eachother, but its hard to think its all coincidence.