[LGCubana]

Trying to order the right part, but I keep coming up against multiple options.
Anyone have insight, on which is the right part for a 2011, E90, N55 ?

e.g.
OEMBimmerparts
Bosch Post CAT Front manifold sensor, Cyl 1-3 (560 mm)
Bosch Post CAT Rear manifold sensor, Cyl 4-6 (490 mm)

ECS Tuning
Looks like the wrong termination type


When I changed my spark plugs, the two O2 sensor terminations looked like this:

[mfractal]

PM me your full VIN and I'll tell you

[juld0zer]

N55 only has two sensors, as it only has one manifold. Both sensors are on the cat/downpipe

[AtlasM]

Here is the parts catalog section for 2011 E90 N55 oxygen sensors:
http://www.realoem.com/bmw/enUS/show...diagId=18_0850

Part # 11787596924 is the pre-cat sensor and 11787589475 is the post-cat sensor.

The ECS page for part # 11787589475 says "rear O2 sensor."

[LGCubana]

Thanks, AtlasM

[3002 tii]

Deleted as to not confuse others

[Kevin39]

Originally Posted by 3002 tii

The rectangular plug is pre-o2. The more rounded looking one in the first picture is post-o2.

I have the same car as OP and both of mine are rectangular.

[3002 tii]

Originally Posted by Kevin39

I have the same car as OP and both of mine are rectangular.

My mistake, got confused with n52