[2003 Subaru Outback, ECM/Inputs/Outputs Scandata] look at your mode 6 values . a p0420 with a failed mode 6 cat test with passed mode 6 front afr sensor and rear o2 sensor tests equals a bad cat converter . [2003 Subaru Forester XS, ECM/Inputs/Outputs Scandat... Login to read more.

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