Quote:
Originally Posted by racingbmwm3
Rear sensors are purely for determing cat efficiency and will not throw any other codes.
Your code is for a pre-cat (front) sensor anyway. If you aren't getting a fault for the rear, then they are fine.
Have you tried swapping the front 02 sensors around to see if the fault follows the sensor? Could be a new defective sensor. Or try putting the original sensor back in place of the bank 2 front sensor that is throwing the fault.
Did you reset the adaptations after doing all that work? If it was running WAY lean before because of the vacuum leaks it could run rich after the repairs. But if you have driven 2k since then, that isn't likely.
So, its not a bad fuel injector or coil, if changing out the bank 2 pre-cat O2 sensor doesn't fix it, then try swapping around the spark plugs. While doing that, look carefully at all the plugs and note any that look different than the others. A black or wet plug is the culprit.
Clean the MAF yet?
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I did try a variety of things with the pre-cat O2 sensors including 1 old and 1 new in each location, swapping them, etc. I had the adaptations reset by a friend with a special scanner and it took about 300 miles for the code to come back. That was when I decided to try a different manifold on bank 2. The spark plugs were just changed recently and the plugs that came out had no noticeable differences from cylinder to cylinder.
What does this code actually mean? I'm interpreting as the ECU sensing a slight lean condition that is not enough to trigger a lean code, but the computer is trying to richen up the mixture to the point where it hits a max richening value. Is that right?
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2006 X5 3.0i: Jet Black with Truffle Brown Interior, Auto, Navi, Xenon, Premium
2007 335xi: Black Sapphire Metallic with Black Interior, Manual, Xenon, Premium, Sport, Cold Weather
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