BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST
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P0420 Won't Go Away
| 04-14-2024, 07:29 PM | #1 |
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P0420 Won't Go Away
Hey friends,
Since I’ve had my 2013 328i xDrive, it’s thrown the error code P0420. I’ve also had the occasional System Too Lean or System Too Rich Codes. History, replaced Oil Gasket, HPFP, Vacuum Pump, Valve Cover + Gasket. I’ve tried replacing both O2 Sensors (both were black). After using CataClean, my fuel economy went up from 24 to 32, but the check engine light came back on with Fuel Evonomy of 28. Any ideas on what to do next? |
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