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2009 Ford F-250 Super Duty Question: What are the Recommended fixes for DTC P0420



, 5.4L V8, Point Roberts, WA, April 10, 2014, 18:28

After fixing leak at the pipe and manifold (left bank) and replacing ALL O2 sensors that cat code came up. Any fixes other than replacing Cat?

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  • Answer #1

    April 11, 2014, 23:10

    Probably not. IF emissions testing is done where you're at , you might seriously consider factory converter , as I've seen many aftermarket converters that aren't up to par with OEM converters. Just a thought.

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