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I have both the P0401 and P1270 codes coming up on my 2004 Freestar.

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I have both the P0401 and P1270 codes coming up on my 2004 Freestar, are they related? I recently repaired the exhaust, and then these two codes came up...had no issues before...can I assume I have a blockage somewhere? And if so, how do I go about diagnosing it?

Vehicle: Ford, 2004, Freestar, 4.2

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