Down pipe with only one cat - Chevy HHR Network


2.0L Performance Tech 260hp (235hp auto) Turbocharged SS tuner version. 260 lb-ft of torque

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Old 05-17-2018, 06:27 PM   #1  
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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”
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Old 05-17-2018, 08:25 PM   #2  
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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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