Hey it's time to replace the 02 sensor but I'm trying to figure out which one will be the best/least expensive option.

On rockauto they have ACDelco, Delphi, Bosch and Airtex ranging from $105 to $240.

Are there any real differences between these pieces or just the name? I want a good piece but why pay more for the same?

Thanks in advance for your insight

 

Buy something that is rated for OEM replacement, this label means it was tested and guaranteed to work in your particular car; these units also have the connector attached to the cable and does not require any cutting and soldering.

There are cheaper replacements out there that may work, but may require you to install the connector on the end. o2 sensors are very sensitive to resistance in the leads since they work on such low voltage. IMHO replace it with an exact unit since it is such a critical part in managing the engine, with the price of fuel nowadays you will not regret it!

 

The Bosch unit is original equip and are available outside of BMW for cheaper.I did this and it came as a straight install correct plug included.