o2 sensor
 

Hi everyone. I have searched for threads on o2 sensor replacement on 2011 x5 35d. My question is BMW service manual says replace the o2 sensor at 100,000 miles. I am not throwing any codes, car is running normal and I just want to throw the dumb question out there "should I replace this" as normal maintenance? The car went out of extended warranty at 100,000 miles and I am doing all maintenance but am addmittedly ignorant around sensor "stuff" .... thanks for all helpful answers - this is a great forum!

You know the old saying, if it aint broke then don't try to fix it. I would wait for it throw a code. The vehicle will still run if the O2 sensor throws a code.

I read that there may be a TSB on replacing these - have you checked to see if your car is included?

The O2 sensors in a diesel only marginally affects fueling, unlike the gasoline equivalent.

The primary reason that is there is for close loop feedback for the EGR operation.

By looking at it, it also seems like a wideband O2 sensor which would make sense given the very broad range of AFR diesel run. In other words, not needed. A traditional narrow band used in manifold injection engines won't give much readings

If you want to do the equivalent of replacing the O2 sensors in a diesel, pull the MAP sensor (mounted on the intake manifold) and give it a good clean since it can get dirty with soot and oil. I use throttle body cleaner. Note that with time the rubber grommet holding it hardens so after removal you may not have a good seal with the old grommet so consider buying one before hand. It's cheap.

Thanks so much. I'm going to hold off on the o2 sensor and did a MAP sensor clean for now!