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BMW CCA Member
750 owners : What O2 sensors to buy?
Hey everyone, my gas mileage has become very bad about 8mpg. I don't think the car has ever had an o2 sensor replaced as it is currently at 90k. I was wondering what all the 750 owners on here use to replace their O2 sensors with? FCP shows 3 options, two for the rear and one for the front, what should i get?
Front:
1) Bosch 13477
Rear:
1) Bosch 13475
2) Bosch 13755
Thanks
Member
I have only done fronts, and 13477 is correct.
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Did it make a difference? Improved MPGs?Originally Posted by psjr
Member
BMW CCA Member
Hmm, even I want to know why did you change your o2's? I'm getting real bad gas mileage. But no check engine light or any other warnings.
Oh and why only the fronts?
Member
I was getting somewhat bad mileage, I think about 18-20 highway. I don't recall that the O2s changed much, maybe 1 or 2 MPG, but maybe not.
Also a bad torque converter at that time causing lower MPG on that car. I still get about 22 highway and 13 combined on it, worse than it should be IMO, but there is a lot more tuning up I need to do.
Only the fronts because the rears are only to check the catalyst efficiency and don't affect MPG or anything about the car running. I don't see a need to change them unless there is a code for the rears or a code for catalyst efficiency.
Chrome & Burl
Wow, I thought my 11.8 avg was bad! Good price on those pre cat sensors!
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O2 sensors are considered wear items and should be replaced every 100,000 miles or when the engine (i.e. burning oil) causes them to foul.
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O2 sensors slow down on reacting to levels. If you wait till there's a code you've gone past bad and now it's just dead.
Trevor
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