P1151 is basically a lean code for Bank 2 Sensor 1.
Have you changes that sensor yet?
A quick and easy way to verify it is the sensor is to switch it out with the O2 on Bank1. If the issue now is on Bank 1 then BINGO!
If problem continues on the Bank 2 side then I would be looking elsewhere.
Do you have a way of monitoring the O2 sensors?
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