2012 Ford Focus SE Mode 6 MID $21 - TID $81 code

jwillman

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I have a recurring P0421 DTC with no drivability issues.

Recently I have a failed mode 6 Catalyst Monitor bank 1 MID $21 and TID $81.

I have looked at live data and the upstream A/F O2 reads normally as does the downstream O2.

I read that Ford listed mode 6 data at the Ford site but I can't find it.

Are Mode 6 diagnostics available somewhere?

Thanks for any help.
 

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