O2 Sensor Removal N52

O2 Sensor Removal N52

For just the Bank 2 Up-stream Sensor
Published by ENINTY
11-27-2010

O2 Sensor Removal N52

Now that the Bentley repair manual is out, it seems a bit pointless to write DIYs for repairs, since they are covered in the manual. But I have found that most repair manuals leave out the little details for the various procedures they cover, which are the things you really want to know anyway. With that in mind I decided to share a remove and replace DIY for one of the E90 N52 O2 sensors.

This DIY is for the Bank 2 Sensor 1 (the harder of the two up-stream sensors to replace). The good news here is once you get to it, it screws out of the manifold quite easily (good job BMW for using anti-seize at the factory and good exhaust manifold material - stainless steel), the bad news is getting to it.

This DIY is long, so I've made it as a MS Word file so it can be printed. As usual I didn't take any pictures (it takes too long to complete the job), but the DIY is descriptive enough that you really don't need any.

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DIY for O2 Sensor Removal.doc (43.5 KB, 752 views)

By be-em-veh-808 on 09-06-2012, 04:52 PM

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ENINTY ---

Great write-up! Thanks for posting.

I'm getting ready to tackle the B1 S1 sensor in my 07 Wagon. Would you say B1 S1 is much easier to get to and complete the job?

BTW --- $55 for the O2 sensor, Genuine BMW part --- what a deal!!!

Now, the part sells for $140+ (Bosch) and $200+ (Genuine BMW).

JC

By Efthreeoh on 09-06-2012, 08:35 PM

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Quote:

Originally Posted by be-em-veh-808

I've done this job. The Bank 1 Sensor 1 is the easist to get to, but you still have to remove the engine cover (and cowling) to get the sensor unpluged.

By DJ Apex on 09-06-2012, 10:28 PM

and $55 is for a Universal 4-Wire Oxygen Sensor
not a oem plug and play

By be-em-veh-808 on 09-07-2012, 12:23 AM

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Quote:

Originally Posted by Efthreeoh

I've done this job. The Bank 1 Sensor 1 is the easist to get to, but you still have to remove the engine cover (and cowling) to get the sensor unpluged.

Thanks for sharing your experience. Not excited about removing all the cowling, cabin air filter, and other items just so I can remove engine cover

.

So, when you removed the B1S1 sensor, did you have to remove anything that had to do with steering rack or tie rod? My Bentley manual said 'remove the right tie rod from the steering rack'

Also, was removal of the sensor fairly straightforward --- or did you really have to work at it or use the big breaker bar?

I bought an off-set type sensor socket --- is that what you use?

Thanks in advance EFT!

By be-em-veh-808 on 09-07-2012, 12:24 AM

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Quote:

Originally Posted by DJ Apex

and $55 is for a Universal 4-Wire Oxygen Sensor
not a oem plug and play

So, how does one make the universal 4-wire O2 sensor work on an E9X?

Thanks!

By Efthreeoh on 09-07-2012, 05:00 AM

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Quote:

Originally Posted by be-em-veh-808

Thanks for sharing your experience. Not excited about removing all the cowling, cabin air filter, and other items just so I can remove engine cover

You must be talking about the B1 S2 O2 sensor then. The Bank 1 Sensor 1 is the O2 sensor in the top of the front exhaust manifold (cylinders 1, 2, 3) that you can easily see on the right side of the engine. This this for an N52 of course, which is the engine in your car. I have both types of sockets (off set and deepwell-split). Either should work.

I did my sensor just after the time Eninty posted the DIY and the price for the OEM sensor (B2 S1) was $55 from Tischer.

By be-em-veh-808 on 09-07-2012, 11:19 AM

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Thanks EFT.

I'm certain about B1S1. I looked under the hood this AM. You are correct --- it is clearly visible and reachable w/o removing the engine plastic cover. However, to remove the O2 sensor wire plug/harness, it appears to be further towards the rear of the engine. I could not see where the wires ended. So, looks like I need to remove the engine cover.

Quote:

Originally Posted by Efthreeoh

By Efthreeoh on 09-07-2012, 09:28 PM

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Quote:

Originally Posted by be-em-veh-808

You do. Sorry.

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