Since the code could also be related to the O2 sensors, you should check the bank 2 upstream and downstream oxygen sensors. These sensors play a crucial role in monitoring the exhaust gases and can affect the catalytic converter's efficiency.
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GMC and other automotive manufacturers often release Technical Service Bulletins for common issues. Check with your dealer to see if any TSBs related to your problem exist and if they have been applied.
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One of the main concerns when upsizing tires is the potential for rubbing against the fenders or suspension components, especially during turns or over fnf game bumps. To avoid this, you may need to make modifications such as installing a leveling kit or lift kit to create more space for the larger tires. Keep in mind that these modifications can add to the overall cost.