Quote:
Originally Posted by Roman D
Oh, wow! That is a brainstorm.
You ara absolutely correct, I have this X5 for couple of month now. Someone on this forum once said - if you about to buy an X5, be sure that you willing and able to throw $3-4k at it within first half a year of ownership - that was not a joke  .
How do I differentiate oem o2 sensors from generic?
I can check if wiring was spliced - should be easy. Also, I am guessing, if connectors are cross swapped, it should be visible as well, if I am looking specifically for that.... |
Um, no, unfortunately things are not always as simple as they may appear on the surface.
"Direct Fit" O2 sensors have the connector on the pigtail, they may not be from the BMW dealer, but they are "Plug & Play". "Universal" fit O2 sensors require the connector from the original O2 sensor to be cut off and then using crimp connectors supplied with the "Universal" fit sensor the wires are spliced. The problem is the O2 sensor wiring is POLARITY specific. If you swap the wiring polarity on an O2 sensor then it works BACKWARDS. Wire color coding may not match up and then people make a guess and can make things MUCH worse and they do not even realize they are creating a problem.
As for the O2 sensors being swapped Bank to Bank, NOTHING is labeled and this is where the problems start. The engine bay wiring harness has no labeling so there is no point of reference. Often the wiring can easily be swapped an again, nobody is aware of this.
When buying a used car of any age, I always go into the deal ASSUMING nothing was done right with prior repairs. I then methodically verify every single aspect of the subsystems as I sort out the molestation of prior owners and foolish mechanics.
You may want to read my comments here, read them carefully. You want to verify 100% that the O2 sensor wiring is correct.
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