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Old 11-11-2019, 08:47 PM
2005-E83 2005-E83 is offline
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2005 BMW X3 Upstream sensors

Is the upstream sensor on the BMW X3 an Oxygen sensor or a Air-fuel Sensor? An if its a Air-Fuel Sensor what should be the voltage reading on it?

Also what should be the voltage reading on the downstream sensor?
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Old 11-12-2019, 04:45 AM
BMWaufKS BMWaufKS is online now
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IDK, but that information is available online via a Google search. Or better yet, run INPA which gives the real-time values and shows via a bar-chart if the values are in range or not.

If your "lamda" (O2) sensors are original, I'd replace the upstream ones now just as general maintenance. Search on here for advice on the recommended offset socket.
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Old 11-12-2019, 09:00 AM
2005-E83 2005-E83 is offline
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I have already replace the upstream O2 sensors with Bosch sensors, currently at 152K on the vehicle. When I run the data stream Im getting the same readings as the old ones. They read a steady signal of 1.41V and fluctuate very little.

After doing some research I found the Air-Fuel sensors read a steady signal, but the Oxygen sensors switch between lean and rich constantly between .900mv and .100 mv.

When I look on google for the sensors or to purchase they are refer to as Oxygen sensors. But if I use the word Air-fuel sensor then I get a few sites referring to it as a Air-fuel Sensor. So base on the readings Im getting Im assuming is a Air-Fuel Sensor.

I need to know this information to eliminate the possibility that something is wrong with my upstream sensors. So I can move to troubleshoot the downstream sensor.

Im getting a P0041 and P2096 codes, when I test the downstream sensor and the car is at running temperature B1 S2 drops to .0 Volts, only when I accelerate the engine the reading move slightly and then drops back to 0. Sometime this week I should be looking at the long term fuel trim to make sure I don't have any vacuum leaks. As of right now I think the sensor is bad.

B2 S2 stays around .21V. According to my research a good working system the readings should be around .45V.

Last edited by 2005-E83; 11-12-2019 at 09:02 AM.
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