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Discussion Starter #1
Does anyone know how to check if the upstream sensor on 2008 sx4 is wideband or narrowband?
Since there is no dealership in Canada there is no one to call and ask
2008 Suzuki SX4 Hatchback AWD Automatic
 

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Discussion Starter #3
I called them and they told me they don't know (their system doesn't have such information). Just told me to buy if I need it...
 

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According to Bosch for your model... :)

Premium Wideband A/F Oxygen (O2) Sensors

Wideband/Air-Fuel sensors perform the same function as a regular O2 sensor, but they precisely measure the amount oxygen in the exhaust rather than just switching between rich (too much fuel, not enough oxygen) and lean (too much oxygen, not enough fuel). Our Wideband sensors use a more sophisticated sensing element that provides a signal to the vehicle’s ECU that is proportional to the amount of oxygen in the exhaust.

Position: Upstream

Installation Restrictions: Bosch validated

Part Number: 18059

https://www.boschautoparts.com/en/auto
 
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