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International Automotive Technicians Network
Re: Catalyst Monitor fails to run after Cat is replaced
Posted to Technical Discussion Forum on 4/29/2009

To do the Cat test you have to clear the enable conditions. Maybe the "different" behaviour of the rear o2 sensor will not allow the enable conditions to be met.

The Cat test is also most likely done in stages. Maybe one stage is getting hung up with an inde... Login to read more.