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      09-24-2020, 11:50 PM   #1
filtercoffee
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Z4M post-cat O2 sensors: wide or narrow band?

Does anyone know definitively if our post-cat O2 sensors are narrow-band?
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      09-25-2020, 01:38 PM   #2
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Narrowbands have 4 or less wires.

https://www.bimmerworld.com/Exhaust/...1-406-621.html

Widebands have 5 or more wires.

https://www.bimmerworld.com/Exhaust/...787540167.html

Pre-cat are wideband, post-cat are narrowband.
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      09-25-2020, 04:00 PM   #3
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Thank you for the useful information.
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