Post cat oxygen sensor. It is located after the catalytic converter. Select O2 sensor location from the menu. Made By IDO pipe
X5 4.4i 2004-2006 \/ Drivers Side After Catalyst,X5 4.4i 2004-2006 \/ Passenger Side After Catalyst,X5 4.8is 2004-2006 \/ Drivers Side After Catalyst,X5 4.8is 2004-2006 \/ Passenger Side After Catalyst
