Need to Replace O2 Sensor - Bank 2 Series 2. for a 2003 525i

[Buster08]

Is this an easy DIY job? I borrowed an O2 Sensor socket, but it looks like I tight fit. I could not find an detailed post or instruction. I'm going to work on it this weekend and would appreciate any suggestions.

Thanks.

[StephenVA]

WD-40 2 days BEFORE you crank on it

[Mike WW]

Easy job. Even the front ones aren't bad, but the rears are easy. IIRC I used a 7/8 combo end wrench, not a socket.

[Buster08]

I will start WD this afternoon. I may pick up a 22m open-end wrench just to be on the safe side

Thanks

[Buster08]

Update: I replaced the O2 Sensor for Bank 2 Sensor 2 with Bosch replacement. The code cleared the engine ran smooth, but 25 miles later the code is back saying Bank 2 Sensor 2.

I'm going to recheck the install wiring, etc. but any thoughts if something else is triggering the code Thanks