Quote Originally Posted by philbyil View Post
Howdy Folks...

Replacing my 02 sensor shortly and wondered if anyone has R&R'd one on a 525i M50 without dropping the exhaust??

If so, what type of socket/wrench did you use...

Thank y'all
at least everything after the cat. The O2 sensor is on top of the cat. The socket has a slit in the side of it to keep from damaging the cable built into the sensor. Honestly, you could just cut the cable on the old one and use an open ended wrench to tighten the new one.

Dumbass me, I bought the socket for the 1st time I changed the sensor, then years later I couldn't find it and had to order another one. They are about $15 from Bavarian. Maybe you could get the free loaner from Checker auto parts.

If the sensor won't budge, use some PB Blaster to get the thread good and wet. There is anti-sieze compound on the new sensor's threads.

JD