O2 sensors
12-02-2021, 11:14 AM
#2
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You have 4 O2 sensors, There are two exhaust manifolds and each has a sensor in it, and then there is one after each catalytic converter.
12-02-2021, 05:16 PM
#3
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Thread Starter
ugh great isn't there a way that I test each O2 sensor by using ohms. Isn't there supposed to be a range that the meter is supposed to be in and if it's out of that range that's the bad one. Unless I should just replace them all?
12-03-2021, 06:56 AM
#5
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Yeah, this isn't helpful without seeing the actual BMW codes you received. For example, if you got a code saying your catalyst efficiency had dropped then I would either replace the post-cat O2 sensors, swap them with the fronts, or check that the cats are still good. I believe when the car is running you can generally put a voltmeter on the sensors and see what you're getting but I'm not too familiar with that. Just remember the 2 sensors in the exhaust manifolds are the ones that help your engine run properly, the ones after the cats are merely there to check if the cats are still working.
12-05-2021, 06:14 AM
#6
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Thread Starter
Yeah, this isn't helpful without seeing the actual BMW codes you received. For example, if you got a code saying your catalyst efficiency had dropped then I would either replace the post-cat O2 sensors, swap them with the fronts, or check that the cats are still good. I believe when the car is running you can generally put a voltmeter on the sensors and see what you're getting but I'm not too familiar with that. Just remember the 2 sensors in the exhaust manifolds are the ones that help your engine run properly, the ones after the cats are merely there to check if the cats are still working.
Last edited by Flguy76; 12-05-2021 at 08:48 AM.
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