1. Do you have the wiring connection on bosch sensor? There are 4 wires but I want to know what is what.
Example red + black - etc etc. Thanks

2 siemens sensor are different than bosch? And What things changes ?

Greetings from Chile.

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This post was auto-generated based upon a question asked on our tech article page here: BMW E36 3-Series Oxygen Sensor - O2 Sensor - Replacement (1992 - 1999) | Pelican Parts DIY Maintenance Article

I don’t have that info.

We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

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- Nick