Replacing oxygen sensors
 

Hi,

I'm trying to replace the two pre-cat oxygen sensors in my 1998 M3 as done during an Inspection service.

I can't figure out which sensors to order:

11-78-1-427-884-M209
Oxygen Sensor, on CATALYTIC, 990mm, 323i/is/iC (1998-99), 328i/is/iC (1996-99), M3 w/ 3.2L (1996-99), each. Some later E36 models use more than one sensor. Please check your car first before ordering.

11-78-1-437-943-M209
Oxygen Sensor, on MANIFOLD, 990mm, 328i/is/iC (1996-99), M3 w/ 3.2L (1996-99), each. Some later E36 models use more than one sensor. Please check your car first before ordering.

Can anyone advise?

Thanks!

The second one since it is for the manifold, while the other states it is for the cat.

Keith

Thanks. This has to be the most confusing part to order. I called Pelican and they stated the first one, 884. I am very confused.