removing cats or replacing them with hfc

Originally Posted by cab83_750 Does your mileage drop when you "fool" the O2 sensor? If I recall correctly my other cars ecu controls AFR based on readout from the sensor.

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removing cats or replacing them with hfc

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12-04-2009, 06:38 PM

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Island_370

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Quote:

Originally Posted by cab83_750

Does your mileage drop when you "fool" the O2 sensor? If I recall correctly my other cars ecu controls AFR based on readout from the sensor.

AFR's are run off of the front O2 sensor. the back O2 sensor is to monitor the function of the cats.

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