PCGUY112887 Posted April 28, 2008 Report Share Posted April 28, 2008 After seeing some comments from members on Bosch O2 sensors... do Bosch O2's really suck that bad? I have one in my 3500, it seems to work but when I scan my O2 values are EVERYWHERE. It makes no sense really, the values it shows would have to make the engine run like crap (or not even run!) but it runs fine. On the Powrtuner forums they suggested that I may have an exhaust leak causing crazy numbers like I have, but I sure don't hear a leak and don't think I have a leak. I have wondered if it was due to the fact that my headers are setup so the O2 only reads from 1 bank (the front) but I don't know how it could be. Engine runs fine, wideband shows that the engine runs fairly normally, but the numbers are nuts. Maybe my sensor just sucks in this case? Quote Link to comment Share on other sites More sharing options...
jman093 Posted April 29, 2008 Report Share Posted April 29, 2008 o2 sensors are supposed to be all over the place. It means they're switching from rich/lean like they're supposed to. I'm guessing you're seeing it move all over the place from around 200mV to around 800mV and that's exactly what 02 sensors are going to do. Quote Link to comment Share on other sites More sharing options...
PCGUY112887 Posted April 29, 2008 Author Report Share Posted April 29, 2008 More like 0 to 900, it seems totally random... from what I've seen on the Powrtuner website things are not supposed to read like that... maybe I should scan someone elses car and see if it's the same! Quote Link to comment Share on other sites More sharing options...
GutlessSupreme Posted April 29, 2008 Report Share Posted April 29, 2008 Well at any given time a tuned car would probably vary at least 100 mV in either direction at a given RPM/load, but of course then it varies as different RPMs/loads... untuned I guess could be all over the place at idle as the ECM frantically tries to compensate. Can't tune reliably from a narrowband O2 sensor regardless, should have a wideband for that. Quote Link to comment Share on other sites More sharing options...
PCGUY112887 Posted April 29, 2008 Author Report Share Posted April 29, 2008 I do have a wideband, and it reads that everything is fine (aside from me being lean at WOT but that's a different story). That is the odd part is that it reads OK... Quote Link to comment Share on other sites More sharing options...
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