Quote:
Originally Posted by Logicoeur
You misunderstood. I am asking since they are tuned, why are they expecting a CEL. The tunes prevent the CEL from occurring, but not setting the readiness as that is the part that is explicitly illegal. Both posters aha they are stage 2.
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I understood correctly. The tunes prevent the CEL by having the catalyst monitor set to not ready, unless that has changed. Depending on your local emissions, this can be a problem. Hence, catted DP's come into play. You can enable/disable this feature as @orangepeelforest has said.