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Re: Possibly stupid question...non-monitored downstream cats
Posted to Emissions Forum on 12/14/2018 3 Replies

The specific question asks "Why is there no method by which to monitor the down stream CAT on each bank?" on the 03 Toyota V-6 4 Runner.

Short term fuel trim is used for the CAT test (only) - nothing to "see"; Long term fuel trim is used for correction but o... Login to read more.

3 Replies Received (View Replies)