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      11-05-2012, 11:23 AM   #2
No 55mph
1QuikWS6's Avatar

Drives: F32 435ix MSport ->M6
Join Date: Jul 2009
Location: Blitzburgh, PA

iTrader: (97)

Garage List
2016 BMW 435ix  [0.00]
Items #1 & 2 are the pre-cat sensors that help to control car in Closed-Loop mode - hence the word 'regulating' in the description. They read the O2 level in exhaust right after combustion & send this info to PCM. If there is a problem with how the car runs, & it's related to the O2 sensors, then these are the suspect ones.

The other (2), items 4 & 5 are for monitoring effectiveness of cats - if the cats are going bad, these will tell the car based on after-cat O2 levels.
F32 435ix//Mineral Gray Metallic//Black Dakota Leather//Alum Blade Trim//M Sport Pkg//Prem Pkg//Tech Pkg//Driver Assist Pkg//Lighting Pkg//Cold Weather Pkg//Dynamic Handling Pkg//HK Surround Sound+BavSound Stg2//437M Wheels//MPerf Pedals-CF Rear Spoiler-CF Mirror Caps-LED Sills-CF Shift Knob/Shift Surround/M4 Alcantara Armrest//CF Side Grilles//MPE w/CF Tips+CGP VSC-1//Dinan CF Intake//AA FMIC//ER CP+TIC//FabSpeed DP//Active8 Tune