2007 E93 320i - which is bank 1 and which is bank 2??

[johnfm]

So, figure that the bank 2 post cat o2 sensor is shagged.

But no idea which is bank 1 and which is bank 2 on the 4 cylinder N43 engine in the 320i cabriolet.

Any clues, as all the oxygen sensors are different (i think they have different cable lengths)


Cheers

[Neil.D]

Banks are for V configuration engines. As you look at the front of the car bank 1 is on the left - uk drivers side.

A straight 4 will have 1x pre and 1x post O2 sensors and only 1 bank of cylinders.

[johnfm]

That is what I thought - but parts diagrams seem to indicate that the four cylinder cars have cylinders 1&4 in one 'bank' and cylinders 2&3 in the other.

Cheers anyway - I may have to just pay the independent to do it.