How to remove and replace the rear post-cat oxygen sensors on an M54 engine.

New post-cat oxygen sensors: http://amzn.to/2cAUZeH
New pre-cat oxygen sensors: http://amzn.to/2cAVipZ
Oxygen sensor socket tool: http://amzn.to/2cuDgHo

See how to replace pre-cat sensors here: https://youtu.be/21E5_u6dz0s

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