Quote:
Originally Posted by Petro135
I just recently did mine on a 135i. Not that bad, don't have to remove anything but the belly pans. And I did have to cut the open end of a 7/8" wrench to about 6" long to get the room to turn the sensors. The 2 fronts or upstream ones are the ones that mostly go out. I'm guessing a 128 is similar in that area.
Definitely spray them with penetrating spray too
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It’s always highly recommended to replace all 02 sensors at the same time, in short the result of not replacing them all can be catastrophic. There is also such a tool as a o2 sensor socket first the connectors must be disconnected and then you can use a ratchet with an extension to easily remove the o2 sensors, if they are seized in, use PB blaster to help break them loose, spray a conservative amount on the thread area, let soak for a minute or two, wipe off residual fluid, use a breaker bar with socket and extension to torque it loose, ratchet off after that, very easy this way!