Injector and O2 (oxygen sensor) errors

Hello Wayne, I'm a loyal customer of yours and wanted to run something by you. I have a 97 M3 and recently pulled three CEL codes using my Peake tool. First code indicated fuel injector cylinder 3, 2nd and 3rd codes indicated AfterCat O2 Sensor heater, cyl 4-6 and AfterCat O2 Sensor Voltage, cyl 4-6. I'm going to check the relay for the O2 Sensor. I had read somewhere that the fuel injector code could cause the o2 sensor code, is this possible? Performance of the vehicle seems fine, however I am getting some grey/white some when the car initially fires up, but goes away. Is this related or do I have yet another problem on my hands? Love these cars.

Thanks

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW 3 Series (E36) Oxygen Sensor Replacement

[Wayne 962]

The DME gets feedback from the injectors through the electrical signals from the coils in the injectors. So, a code indicating an injector problem is probably an electrical problem. If an injector is not functioning properly, and then causes the car to run lean or rich, then yes, that might show up as an O2 sensor error. In this case, the sensor would be reading an out of spec condition, which might be a problem with the sensor itself, or a problem with the mixture (directly related to the injectors). You can try swapping injectors around to see if the problem follows the injectors too.

- Wayne