As I answered before to your earlier post.
It depends on what state you are in. In California and New York it is illegal to use a non-carb certified unit. Technically it is a violation of Federal law in the other states to install a Federal approved unit on a vehicle that was built under California emissions.
As such I try not to break the law and tell someone else to because the fines for a shop doing that work are very high.
As for the CEL, The design of the old system does not monitor the rear converter so the ECM would not even notice if it was gone from the system. As long as the front units work it should run okay.
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Thursday, September 14th, 2017 AT 5:43 PM