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  1. Gen 5 & 6 Problems/Service Issues/Troubleshooting
    Purchased my 07 used last year & has 193k on it with the 2.2L ecotech engine. The dreaded P0420 came up and figured it was time to replace the Cat since I noticed it's slow to accelerate up to 40mph and engine is running a LITTLE hotter than normal (like just above the middle line, but it's also...
  2. 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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