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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 08-08-2016, 07:26 AM
Gusthehater Gusthehater is offline
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Location: Cleveland, Ohio
Join Date: Mar 2016
Posts: 83
Mein Auto: 2004 325ci
O2 sensor questions....

2004 325ci 3 pedals, 147000miles.
While playing around with OBD Fusion I noticed in the dashboards that o2 sensor one is showing no volts. Thinking that these are probably the original sensors, I decided to replace them(pre cat). After the switch, and some new spark plugs, I'm still showing 0volts to sensor 1.
Any idea what's going on here? I have no idea what to trouble shoot, or if this is somehow normal. I have no engine codes, and it seems to be running fine.
Any guidance would be appreciated.
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Old 08-09-2016, 06:52 AM
marcozandrini marcozandrini is online now
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Join Date: Feb 2014
Posts: 2,441
Mein Auto:
Check jfoj's comments at E46Fanatics. Your car had wide band oO2 sensors. You need to tell OBDFusion that.
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