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Old 07-27-2019, 09:30 AM
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Quote:
Originally Posted by Overboost View Post
You would have codes if any of the 4 were reversed. How old are those sensors? They are only around $50/piece and are really easy to replace. I would replace the upstream ones.
I replaced all 4 of mine. Had poor results with the $50 Bosch splice in sensors. Ended up having to go for the $100 plug and play Bosch units due to fighting o2 codes for a few months. Resetting adaptations was key though after replacing all 4. Just my experience though.
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  #12  
Old 07-27-2019, 10:04 AM
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Mu precatalyst sensors were just under $65 from FCP Euro. Not sure if the V8 uses a different sensor thank the 3.0

https://www.fcpeuro.com/products/bmw...or-bosch-13477
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  #13  
Old 07-27-2019, 10:26 AM
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Quote:
Originally Posted by Overboost View Post
Mu precatalyst sensors were just under $65 from FCP Euro. Not sure if the V8 uses a different sensor thank the 3.0

https://www.fcpeuro.com/products/bmw...or-bosch-13477
Yep, they do. V8 guys get taxed again. Sorry, for some reason I thought they would be similarly priced. At any rate, I agree @ 180k, they're due for replacement.
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  #14  
Old 07-28-2019, 10:48 AM
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This happened to me On my 4.4 2005. I replaced all O2 sensors as they were reading slow. And the monitor never set. Replace them then do an adaptation reset and drive it.


Side note: I never had a check engine light on.


Edit: I purchased the OE sensors at Rock auto, they were the cheapest one about $100 total in difference.
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