Looks like you have a ‘91. I️ still have OEM cats in my ‘91 and the O2 sensors are on top of the cats. There are no upstream sensors on the ‘91.
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'07 e65|N62 - Alpina B7 - Black Sapphire|Black|Loaded|GONE
'02 e46|M54 - Orient Blue|Beige|'Vert|GONE
'00 e39|M52 - Anthrazit Metallic|Grey|GONE
'01 e38|M73 - Anthrazit Metallic|Schwarz|Shadow-Line|GONE
'91 e31|M70 - Schwarz|Schwarz|M70|FOR SALE
'13 328i Auto - Black Sapphire|Coral Red|Sport Line|GONE
'05 545i SMG - Jet Black|Black|Bamboo Anthracite|GONE
'07 335i Auto - Montego Blue|Grey|GONE
'05 545i SMG - (Euro Delivery 7/22/05)|Black Sapphire|Auburn|GONE
'97 528i Auto - GONE
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