Down pipe with only one cat

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05-17-2018, 06:27 PM

ULOS2A6

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Join Date: 02-10-2013

Location: Fullerton,Ca

Posts: 98

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”

05-17-2018, 08:25 PM

donbrew

Technical Moderator

Join Date: 01-23-2009

Location: Fredericksburg, Virginia

Posts: 24,688

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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