So regarding the o2 sensor as I said In original post ita bank 1 before cat

So from looking on micks garage at bosch ones which would be oem quality I presume
There are 2 I narrowed it down to
The item description says
" in front of catalyst "

And the second one says " post cat"

I just want to be sure but it's the first one I need?
Car has four sensors

2 x 990mm length and 2 shorter ones
But I'm not sure from the real oem diagram which is before or after cat
Thanks


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