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2009 X Premium Auto
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56 Posts
Discussion Starter · #1 ·
So I’ve been being a good little mechanic and just looking at the live data of my “new” to me 09 foz and noticed something..off. My o2 sensor bank 1, primary o2 sensor I presume is reading at over 2 volts!! Standard reading for that o2 sensor should be between .1 and .9 volts.

Could it be that it’s not properly grounded? Something definitely off as well as that the primary and secondary sensors were just dangling in the engine bay, they are missed their harness that attaches them to the upper and lower engine.

Could that be throwing off my ground signal or is my thinking all together here not ground related?

Thanks guys and such help or tips GREATLY appreciated!!
 

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2012 Forester 4 speed auto
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1,128 Posts
It's correct

It's an air fuel sensor and the correct voltage is 2.4 volts plus or minus .2. The down stream O2 sensor is suppose to be .1 to .9 Volt. If the mileage is good don't touch anything.
 
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