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#1
01-23-2016, 08:41 PM
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p0161
 No biggie. My question is what sensor is Bank 2 Sensor 2 ? Can't seem to find which one it is. Is there anything I should check before I order a new O2 sensor ? Thanks
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2011 BMW X5 35d Deep Sea Blue Metallic w/ 3rd row Custom Kicker Audio System Style 259's on Dunlop Sport Maxx Run Flat Tune and Exhaust Coming Soon.... 05' Ram SLT 2500 5.9l Cummins (Gone But Not Forgotten) 2008 BMW X5 3.0si Alpine White III (Sold) 2002 BMW X5 3.0 TitanSilber Metallic 
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#2
01-23-2016, 09:02 PM
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Huh, You think its a bad O2 sensor?
Which code is it? Sensor code or sensor HEATER circuit? If you've damaged the wire to the sensor- cut it, crashed into a hard snow bank, hit something...or blown the fuse, the car will immediately see an open circuit on the O2 sensor preheat. It will then never attempt to use the O2 sensor itself. It *CAN* also be in internal fault in the O2 sensor, wher ethe preheat side of it failed...not saying that is not possible. If you clear the code it comes back immediately on start up, right? A bad o2 sensor will usually take some time to show up as out of range, but the open heater circuit is immediate. Id check the connections to the sensor, AND the fuse. Could also ohm out the sensor. Once you rule out wiring/fuse, go order the sensor GL
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#3
01-25-2016, 11:56 PM
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I haven't had time to check it yet. My questions still is where is bank 2 sensor 2 ? Can anyone be kind enough to point out which one it is ?
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2011 BMW X5 35d Deep Sea Blue Metallic w/ 3rd row Custom Kicker Audio System Style 259's on Dunlop Sport Maxx Run Flat Tune and Exhaust Coming Soon.... 05' Ram SLT 2500 5.9l Cummins (Gone But Not Forgotten) 2008 BMW X5 3.0si Alpine White III (Sold) 2002 BMW X5 3.0 TitanSilber Metallic
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#4
01-26-2016, 12:33 AM
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Sensor 2 is usually after cat, AKA 'downstream'.
Bank 1 is cyl 1-3, bank 2 4-6 HOWEVER, I just pulled that up with 30 seconds of google. Use at your own risk. Honesly google yourself or call a parts counter (or ping the company that is selling you the sensor) for your own info. And...O2 sensors are a wear item. Buy both, replace both. Good for another 60k -100k
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#5
01-26-2016, 01:46 AM
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Bank # is left or right side of engine.
Bank 1 is on cylinder 1 side of the engine Sensor # is a sensor location down and away from engine. Sensor 1 is pre cat also called High side Sensor 2 is post cat also called low side Sensor 1 on both banks is used for air to fuel mixture measurement after burn cycle. This sensor(s) is(are) one responsible for working with MAF (mass air flow sensor) to measure fuel/air mixture as it burns. Sensor 2 is only responsible for catalysis. In other words Sensor 2 tells you if cat is good or bad. O2 Sensor Identification and Locations - o2 sensors
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