update: Just googled P1183 and found
'P1183 O2 Sensor (Bank 2 Sensor 2) Open Circuit During Coast Down Fuel Cut-off'
this may help?
I still dont know where in the car this sensor is located though.
2004 e46 stuff for sale. please contact.
roof rack (OEM)
16" alloys (OEM)
e46 roof lip/spoiler (black)