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Old 08-12-2004, 05:36 PM
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Re: 1st gen b16 with both o2 sensors, which header

OBD0 PR3 = two 1 wire o2 sensors

OBD1 P30 = one 4 wire o2 sensor.

the correct location for OBD1 4 wire O2 sensor is located down after the collector, before the cat,on the header.
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