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Reaper, more than likely you have a fuel problem that allows too much fuel into one bank. That would explain the meltdown of the cat and the O2 sensor. The ECU won't send more fuel than the system can handle, no matter what any of the sensors tell it to do (the long and short term fuel trims can only add or subtract so much fuel.) You may have an injector(s) that is not completely shutting off or a bad fuel pressure regulator. Just a heads-up...
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
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