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Re: Catalyst Monitor - P0420 Catalyst Efficiency below threshold.
Posted to Technical Discussion Forum on 8/25/2001 2 Replies

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It's been a issue with the 2.0 for some time . Here is an example of the problem in the MX6's cousin .

Less fancy tool Diagnosis.

With the TSB and Fed 8-80 warranty the end result were the same . ... Login to read more.

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