Down pipe with only one cat

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May 17, 2018 | 06:27 PM

ULOS2A6

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Joined: 02-10-2013

Posts: 98

From: Fullerton,Ca

Down pipe with only one cat

Does anyone know if a down pipe without the rear cat could make the rear O2 sensor show as “ not ready”

May 17, 2018 | 08:25 PM

donbrew

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Joined: 01-23-2009

Posts: 26,483

From: Fredericksburg,VA

The second cat has nothing to do with the sensor.

"not ready" refers to the OBD2 test, it has not run yet.

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