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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: (90)

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//Brushed Aluminum Trim with Black Accent//M Sport Pkg//Premium Pkg//Technology Pkg//Driver Assistance Pkg//Lighting Pkg//Cold Weather Pkg//Dynamic Handling Pkg//Harmon Kardon Surround Sound//MPPK//400M Wheels//MPerf Pedals//MPerf CF Rear Spoiler//MPerf CF Mirror Caps//Mperf LED Sills//Mperf CF Shift Knob//AutoCarbon CF Side Grilles//BMS Burnt Tit Exh Tips