# O2 Sensor Voltage

**URL:** <https://forums.speedlife.net/t/o2-sensor-voltage/37201>\
**Category:** NYSpeed Automotive\
**Created:** [October 18, 2007, 9:57am UTC](https://forums.speedlife.net/t/o2-sensor-voltage/37201 "2007-10-18T09:57:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![timo](https://avatars.discourse-cdn.com/v4/letter/t/c4cdca/32.png) [@timo](https://forums.speedlife.net/u/timo)\
**Post date:** [October 18, 2007, 9:57am UTC](https://forums.speedlife.net/t/o2-sensor-voltage/37201/1 "2007-10-18T09:57:54Z")

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Looking to NOT replace downstream 02 sensor (after cat). Wonder if anyone would know this- can I feed a voltage to the ECU from the 02 sensor lead that would keep a fault code, and check engine light from occuring? Would the impedance matter? What voltage would I need? Car is '97 Ford Aspire. New O2 sensor $260