E46 M3 Bosch Oxygen Sensor guide

[sapote]

Do all S54 years use wideband sensor or only the later cars?

[cornerbalanced]

For those with catless headers, only sensors that matter are pre-cat cyl. 1-6 correct?

[Tbonem3]

You're gonna feel like an even bigger doofus when you find out that the actual sensor (not the harness/plug) is only $20, and you can splice a new one in using the existing cable harness which is the "special part" that allows them to charge $100+ ea.

[gixxer]

I must have been a real doofus to use the OE sensors all these times.

BOSCH, maker of the OE sensors, their prices, are these legit prices (from ECS Tuning).

Usual BMW markup's over their BOSCH OE supplier's same parts?

Urgh.......

BOSCH part numbers below are just as good, if not same as BMW's own, right? (yes, stupid question)

[Phoenix///M3]

I found this incredibly useful when doing headers

https://drive.google.com/file/d/1AP7wcykYWjHvsiEKWOzWEMddagd_kbSb/view?usp=sharing