Second o2 sensor?
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Volvos use 4 wire O2 sensors - which have a heater and a sensor (the sensor needs to be around 600 degrees to read properly) so if you are thinking of simply doing without the sensor, you'll get a check engine light with codes. if you don't plug the sensor into the pipe, you'll had a little hot item to contend with.. The readings from the sensor also feed into the computer to adjust the mixture as well so that's going to impact performance.
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