P0133 Code: Which O2 Sensor to replace?

[TroyAndEddie]

Pulled a P0133 code (Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)) before resetting it. Found out it's one of the O2 sensors, but I don't know which one to replace? Is it #7 or #8 in this diagram?

http://realoem.com/bmw/diagrams/f/r/196.png

[familytruckster]

Bank 1 sensor one is the pre-cat one. Number 7.

[IgotBMW]

I second that. Easy DIY. Just may be tough to break the O2 sensor nut.

[familytruckster]

Though before ordering, make sure all the vacuum lines and intake boot are good. Leaks can cause some 02 codes to be thrown.

[Gaston]

Are both these O2 sensors the same part #?

I only see 1 type here:

http://www.pelicanparts.com/bmw/catalog/shopcart/BE36/POR_BE36_EXHmuf_pg2.htm

[pdxmotorhead]

There are several lengths of wires on the sensors depending on Auto vs manual and OBD1 vs OBD 2... I found that my local auto parts store sold the Bosche sensor in their generic box for 1/4 of the cost of BMW...

Dave

[Gaston]

NAPA, Pepboys, Autozone?

How much?