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  1. 2011 3.6L LY7 with P0420

    Gen 7 Problems/Service Issues/Troubleshooting
    As title says, 2011 Malibu 3.6L V6. Additional info: 141,xxx miles on car but only 47,xxx on engine (replaced at 94,xxx under warranty) - unsure if cats are original or if they were replaced with the engine I almost always use Top Tier fuel Oil is changed regularly using full synthetic No known...
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