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Old 05-26-2021, 11:16 AM
andrewwynn's Avatar
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Location: Racine, WI
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andrewwynn will become famous soon enough
AWR-FIX: O2 Sensor on N63

So imagine wife's frustration when we replaced her '01 E53 largely because the cats are worn out and we get a repeating low cat efficiency error and 2 weeks into owning '12 E70 the SES lights up with a code for post cat o2!

Anyhow it's very young for an O2 to die at 76k miles but it did.

I had no luck finding any helpful how to online and had no idea where to start looking.

I found a pic at real oem showing that both sensors are in the cat so I was pretty sure they would be near the firewall but under or over the engine was the question.

I finally found a YouTube video of somebody replacing the sensor but it was too far in to be very helpful (the air filter box was already removed and the audio was in French or something)

So I took a different approach: search for video that shows how to replace air filter; that was a little more helpful but not great because it was a sedan without the torsion control bar that blocks removal of the air filter box.

I finally found a video with 50i X5 how to remove air filter and the key is to remove the cabin air filter first which requires removing the cowling above it as well.

Fortunately mostly bayonet clips hold that on so it goes quickly.

The trick then is that with the torsion bar in place you can't remove the filter box.

My E70 repair manual doesn't include 50i so I don't know if they tell you to remove the cross bar or do what I did: with the cabin air filter removed I could access the back screws of the intake air filter box and remove the top.

Once that was removed I could also remove the bottom which is socketed onto the valve cover.



The red arrows point to the upstream sensors the blue points to the bank one downstream sensor that I just replaced.

It was much nicer working from the top side and one bonus of an early failure is that it took only 65 ft·lb to release the old one.



Sorry not a visual cookbook with step by step but the description above will get you where you need to go.

Final answer: SES cleared and O2 sensors all working again.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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