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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Which ones here are the pre-cat oxygen sensors?



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      11-04-2012, 11:08 PM   #1
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Question Which ones here are the pre-cat oxygen sensors?

The ones that are changed when something is amiss, which are they?
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      11-05-2012, 10:23 AM   #2
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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.
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      11-05-2012, 06:38 PM   #3
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Thank you for the detailed explanation.
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