I have a engin trouble code of P0133 02 sensor circuit slow response. (Bank 1 Sensor 1) I know that I need to replace a o2 sensor but I dont know which one. Can someone help

 

Sorry I should have mentioned that this was a 1998 F150 4x4 with a 4.6 V8

 

Bank 1 is always the same as cylinder #1.. HO2S-11 is bank 1 upstream sensor.. The down stream are called monitors.. Check the pins in the connectors for damage and corrosion..What you might want to try before buying a O2 sensor, is switch them from right to left, and you should then get a code PO153 if its a defect sensor, as it'll follow on over to bank 2