"heated oxygen sensor voltage low"
read this: http://www.clubwrx.net/forums/2012557-post4.html
This is a discussion on O2 Sensor :( within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; "heated oxygen sensor voltage low" read this: http://www.clubwrx.net/forums/2012557-post4.html...
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abbigale : 06 impreza wrx tr: cobb stage II
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It means the current in the front O2 sensor's circuit is out of spec. The first thing in my view to check is the wiring itself. See this thread plus the linked thread within:
Access is from below and to the side and the fender liner will fight you but it's feasible. If it turns out the sensor itself is at fault then I'd advise using a genuine replacement, but either you or any competent mechanic can fit it if you don't like dealer pricing.
All this assumes the car is stock. I am still a little unnerved by an apparent O2 sensor on a 2006 model. Did you check the owner's manual to see how long your emissions component warranty is and what components are covered, by the way?
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Mine is reading the same thing. I was told that the o2 sensors have two parts. One does the readings, the other heats the sensor when the engine is cold so it works properly. My mechanic said it was the heating part. Doesn't really effect the way the engine works. But, I (and most of us) hate seeing that CEL come on.
po171 system too lean, bank 1...i know their can be a number of things that could be causing this, however i recently started to notice a drop in miles per gallon, i just filled my tank and i went through a quarter of gas already and have only went 50 miles...do these symptoms point at the o2 sensor, or could it still be somthing else...? thanx for the feedback fellas.