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Old 01-22-2005, 12:26 AM   #1
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Member#: 79418
Join Date: Jan 2005
Location: so cal, granada hills
2005 wrx

Default adding a/f meter and aftermarket 02 sensor

hey guys i want to add a autometer a/f ratio gauge, but our cars are 5 volt not one volt like needed. soooo, what i want to do is add another 02 sensor to the exhaust just after the turbo and weld one in with a bung, but my question is more like which aftermarket 02 sensor should i use?
i am figuring honda/acura cause they put out 1 volt, for the meter to measure, but some are 3 and 4 wire does anybody know of one that will work?

or does anybody know of a gauge that will work with 5 volt read input?
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Old 01-22-2005, 07:33 AM   #2
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Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
02 WRX
15 WRX/05 GTO


The factory A/F sensor (front 02) isn't a 5V one although it is a wideband type and regardless of what type of gauge you have it is not possible to tap into it. While you can install a separate 1V sensor and use it for your gauge, this is not really worth the effort since the narrowband 1V sensor won't give accurate readings outside of its 14.7/1 operating point (stoichiometric). The only setup that will provide true, useful A/F readings is a wideband sensor with a gauge designed to read it.
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