# O2 sensor voltage

**URL:** <https://forums.speedlife.net/t/o2-sensor-voltage/37120>\
**Category:** NYSpeed Automotive\
**Created:** [October 17, 2007, 5:32am UTC](https://forums.speedlife.net/t/o2-sensor-voltage/37120 "2007-10-17T05:32:08Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\
**Post date:** [November 16, 2007, 11:35am UTC](https://forums.speedlife.net/t/o2-sensor-voltage/37120/3 "2007-11-16T11:35:52Z")

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[quote=“timo”"]

Have a '97 Ford Aspire with check engine light on. Also, unfortunately has an overdue inspection. Recent scan tells that downstream (after CAT) 02 sensor has problem. Best price for a new one is over $260, and for this car it hardly seems worth it.  
As a fix was thinking I could feed a constant voltage into the ECU from that wiring. Anybody think that would work? Would that keep that fault code from triggering? If so what voltage would I need, and is impedance important?

[/quote]

$252.21 at Carquest…and no feeding a constant voltage to the PCM will not work. The signal has to vary from 0-5volts

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