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This could be caused by a bad front bank catalytic converter ,lazy front upstream oxygen sensor, or an exhaust leak anywhere from the manifold joint to shortly after the converter. Most likely though it's just a software issue. There was a software update for the powertrain control module for catalytic converter efficiency codes that set erroneously when there wasn't actually a problem. The first thing you're going to need to do is have your PCM software updated to the current level and see if the code returns. if you are under 80,000 miles this will be covered under the 8 year 80,000 mile Federal Emissions warranty.