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more info on O2 sensors
Quote:
Originally Posted by X5chemist
... Assuming O2 rear sensors are working properly.
Rear V reading should be around 0.45....
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From a Google search:
 O2 voltage range, per NGK
I copied a graph made using the Torque Pro android app onto my PC for posterity, while hunting (both false, it turns out) P0171 & P0174 codes.
The bank 1 sensor 2 (after-cat) dips as low as .2v, and bank 1 sensor 1 (pre-cat) goes as high as .9v. Please note that both of the after-cat sensors (b1s2 & b2s2) didn't warm up for about 1.5 minutes, according to my graph. Make sure you're seeing similar warm-up times for your after-cat sensors...mine were relatively new (about 2.5 years old, according to the previous owner) when I made this graph.
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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"
Here:
14 Lexus ES350,3.5L-U660E
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